Openfoam momentum source At the end of this duct there is a plenum/centrifugal fan. C Definition at line 56 of file filmMomentumTransportModel. Properties The coded option is available to all primitive field types, i. What I’d recommend is to create a complete fluid geometry covering fluid+fan zones, and a seperate cylinder geometry that will represent the fan momentum zone. 14 OpenFOAM is free software: you can redistribute it and/or modify it Sep 22, 2022 · Hi foamers, I wanted to ask if any of you have experience in using fvModels' momentum source term with interFoam. May 6, 2021 · In this case each member of the momentum equation is divided by rho. Now I know that adding only the mass source term will change the momentum of the system, 11 OpenFOAM is free software: you can redistribute it and/or modify it We would like to show you a description here but the site won’t allow us. 14 OpenFOAM is free software: you can redistribute it and/or modify it Mahdi Torabi Rad Abstract In this chapter, I introduce, document, and verify solidificationMelting-Source: a built-in fvOption in OpenFOAM® for simulating isothermal solidification. Both sides have uniform velocity, normal to the face. Class List | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation CompressibleMomentumTransportModel< TransportModel > Class Template Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Sep 27, 2010 · Hi, I am trying to predict temperature profile in a duct right after an electric heater. e. Instead, it identifies the cells inside of the constructor which allows easier adjustment of the disk parameters and could be developed further to include a dynamic variant. I use PIMPLE solver (no specific reason) and send discrete velocity-values from OpenFOAM to my solver in defined coupling intervals. Whether it's better to change All times are GMT -4. Usage Minimal example by using constant/fvOptions: directionalPressureGradientExplicitSource1 { // Mandatory entries 13 14 OpenFOAM is free software: you can redistribute it and/or modify it 15 under the terms of the GNU General Public License as published by 16 the Free Software Foundation, either version 3 of the License, or 340 const scalar Re, // Reynolds number 341 const scalar mu, // local carrier viscosity 342 const scalar mass, // mass 343 const vector & Su, // explicit particle momentum source 344 vector & dUTrans, // momentum transfer to carrier 345 scalar& Spu // linearised drag coefficient 346 ) const; MomentumCloud< CloudType > Class Template Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation Apr 10, 2016 · Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Programming & Development Jan 8, 2014 · 100" volume is zero or negative: "". C Solver details The solver uses the SIMPLE algorithm to solve the continuity equation: 11 OpenFOAM is free software: you can redistribute it and/or modify it Aug 19, 2015 · hello i intend to couple VOF (interFoam) & DPMFOAM but have some problems in including particle implicit and explicit terms in VOF momentum The coded option provides several hooks that can be implemented in C++ code to manipulate the system of equations, e. Transport equation In previous tutorials you might have seen fancy equations, which describe different phenomena in fluid dynamics. src MomentumTransportModels momentumTransportModels RAS realizableKE realizableKE. The momentum source terms due to the dispersed phase can be identified as those due to the mass transfer and the forces acting on the Jan 9, 2020 · Hi everybody, at the moment I am investigating into the energy equation and the fvOptions possibilities. Oct 9, 2016 · The fvOptions in OpenFOAM is flexible framework to add various source terms to the governing equations without the need to rewrite the original source code. C Solver details The solver uses the PIMPLE (merged PISO-SIMPLE) algorithm to solve the continuity equation: Jul 3, 2020 · Hi Foamers. 477 //- Return momentum source 478 inline tmp<volVectorField::Internal> UTrans () const; 479 480 //- Access momentum source 481 inline volVectorField::Internal & UTransRef (); 482 483 //- Return coefficient for carrier phase U equation Dec 16, 2023 · The ability to inject code into the OpenFOAM solvers through the use of fvOptions can be surprisingly powerful, once you learn a bit of OpenFOAM coding. Transient solver for incompressible, turbulent flow, using the PISO algorithm. I modelled a mixer as a cylinder with a fluid inlet (propeller pressure side) and an outlet (propellor suction side). About OpenFOAM OpenFOAM is a free, open source CFD software package released free and open-source under the GNU General Public License through www. MomentumTransportModel< Alpha, Rho, BasicMomentumTransportModel, TransportModel > Class Template Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation PhaseCompressibleMomentumTransportModel< TransportModel > Class Template Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Aug 27, 2019 · Hi, I was trying to modify the V momentum equation with a source term. by including additional source terms and modifying the equation matrices. Aug 23, 2023 · According to literature, an easy way to model these is as " momentum sources ". This is not needed, and will cause issues. Jun 6, 2025 · Using SimScale, momentum sources can be used to simulate fans, ventilators, and other devices without having to model the exact geometry. Let’s say I assign a “momentum source” to a box and provide a desired mean velocity. Oct 11, 2011 · hi everybody I'm trying to modify the interFoam equations by adding a source term to the momentum equation, i. Operands: All times are GMT -4. Further flexibility is offered via fvOptions —a collection of run-time selectable finite volume options to manipulate systems of equations by adding sources/sinks, imposing constraints and applying corrections. H. 13 OpenFOAM is free software: you can redistribute it and/or modify it eddyViscosity< BasicMomentumTransportModel > Class Template Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation 13 OpenFOAM is free software: you can redistribute it and/or modify it Base class for film momentum transport models. my fvOption We would like to show you a description here but the site won’t allow us. Usage Minimal example by using constant/fvOptions: directionalPressureGradientExplicitSource1 { // Mandatory entries 11 OpenFOAM is free software: you can redistribute it and/or modify it Sep 14, 2022 · Hello, and thank you for using the Forum. Unfortunately, there’s a bit of a lack of good examples or walk-throughs of this capability, so it can be pretty tricky to learn at first. I have read these two pages: but none of them provide any formulae that would help figure out how the input “mean velocity” is represented in the Navier Stokes equations. In createField. Introduces basic C++ concepts to beginner users of the OpenFOAM open-source CFD libraries. scalarCodedSource: scalar equations vectorCodedSource: vector equations sphericalTensorCodedSource: vector equations Would you like to suggest an improvement to this page? Create an issue May 16, 2023 · Thank you both for your answers, which really helped me a lot. Operands 🔗 Jan 8, 2017 · General Coded source Semi-implicit source Momentum Single region Acoustic damping Actuation disk Buoyancy force Change flow direction Explicit porosity Mean velocity force Radial actuation disk Rotor disk Tabulated acceleration Multi-region Inter-region explicit porosity Energy Single region Buoyancy energy Heat exchanger Joule heating Viscous 11 OpenFOAM is free software: you can redistribute it and/or modify it 11 OpenFOAM is free software: you can redistribute it and/or modify it We would like to show you a description here but the site won’t allow us. 11 OpenFOAM is free software: you can redistribute it and/or modify it 100" volume is zero or negative: "". The main challenge in simulating isothermal solidification is the incorporation of movements of the solidification front. ThermophysicalTransportModel< MomentumTransportModel, ThermoModel > Class Template Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation 11 OpenFOAM is free software: you can redistribute it and/or modify it We would like to show you a description here but the site won’t allow us. Considering the momentum equation, it follows: Here, the Cauchy stress tensor is not split into its deviatoric and hydrostatic part (shear-rate and pressure). The turbine is located Construct the momentum equations Under-relax the momentum matrix Solve the momentum equations to obtain a prediction for un+1 Construct the pressure equation Solve the pressure equation for pn+1 Correct the flux for ϕn+1 Under-relax pn+1 Correct the velocity for un+1 If not converged, go back to step 2 SIMPLEC By Van Doormaal and Raithby [89] Mahdi Torabi Rad Abstract In this chapter, I introduce, document, and verify solidificationMelting-Source: a built-in fvOption in OpenFOAM® for simulating isothermal solidification. Sources Table of Contents General Momentum Single region Multi-region Energy Single region Multi-region Atmospheric boundary layer This repository provides an OpenFOAM implementation of a momentum source term designed to generate synthetic atmospheric turbulence within the incompressible Navier–Stokes equations. OpenFOAM is free software: you can redistribute it and/or modify it Go to the source code of this file. They might even be familiar from lectures, that you attended in the past. As I could see in your latest simulations, fan zone is left as a void. Source files filmMomentumTransportModel. " Detailed Description Applies an explicit pressure gradient source in such a way to deflect the flow towards an specific direction (flowDir). - UnnamedMoose/BasicOpenFOAMProgrammingTutorials 14 OpenFOAM is free software: you can redistribute it and/or modify it Nov 21, 2002 · Hi guys, I would like to model the flow between two rooms induced by a fan. C Definition in file realizableKE. The method introduces volumetric body-force perturbations that reproduce prescribed turbulence statistics and spectra (e. Note Under construction - please check again later Momentum Momentum wall functions are imposed by setting the turbulence viscosity at the wall. C Solver details The solver uses the SIMPLE algorithm to solve the continuity equation: Overview Category: Incompressible steady state incompressible Turbulence Finite volume options Equations The solver employs the SIMPLE algorithm to solve the continuity equation: ∇∙u = 0 and momentum equation: ∇∙(u ⊗u) −∇∙R = −∇p +Su Where: OpenFOAM: API Guide v2112 The open source CFD toolbox MomentumTransferPhaseSystem. Is it possible to use a Sep 5, 2023 · OpenFOAM documentation - Finite volume optionsIntroduction 🔗 OpenFOAM solver applications typically include core functionality such as turbulence modelling, heat transfer, and buoyancy effects. C filmMomentumTransportModelNew. The time now is 12:17. To reduce the complex geometry of the fan, I would like to use a momentum The evolution of the particle mass is required besides for its own momentum equation to calculate the mass source term in the spices and the pressure equation of the carrier phase. We would like to show you a description here but the site won’t allow us. H filmMomentumTransportModel. H of the solver we declare a volVectorField and we call it force. Upstream faces are automatically determined using the flow direction and the surrounding face zone. In this tutorial part 1 part 2 Dec 14, 2016 · Hello everyone! I created this thread in the common forum aswell, didn't realise there was a special one for UDFs. 0; 258 259 // Momentum transfer from the particle to the carrier phase We would like to show you a description here but the site won’t allow us. Therefore, I have a few questions that arises. I am trying to create an increase Two particular CFD codes are explored. Pressure-velocity algorithms Note Under construction - please check again later The background to the SIMPLE, PISO and PIMPLE pressure-velocity algorithms can be demonstrated using the incompressible, inviscid flow equations, comprising the momentum equation: ∂ ∂t(u) +∇∙(u ⊗u) = −∇p, and continuity equation ∇∙u = 0. More Go to the source code of this file. It has a large user base across most areas of engineering and science, from both commercial and academic organisations. openfoam. References U. I tried introducing it but, even if OpenFOAM documentation - momentumDescription 🔗 The momentum function object computes linear/angular momentum, reporting integral values and optionally writing the fields. Either mixture or two-phase transport modelling may be selected. When specifying the cylindrical coordinate system, the rotation can be specified directly with e1/e2/e3 axes, or via a rotation sub-dictionary. In the mixture approach a single laminar, RAS or LES model is selected to model the momentum stress. 1: 4 Implementation of the SIMPLE algorithm in OpenFOAM The SIMPLE algorithm can be implemented in OpenFOAM as follows (The complete implementation of the algorithm can be seen in the source code of the simpleFoam solver provided with OpenFOAM): Store the pressure calculated at the previous iteration, because it is required to apply under-relaxation 11 OpenFOAM is free software: you can redistribute it and/or modify it A momentum-source calculator of the actuator-disk model without rotation (ADM-NR) in OpenFOAM to calculate the source terms based on the disk-averaged velocity. Below, there is an example project to simulate internal fans by using momentum Jul 16, 2020 · I am trying to figure out what “momentum source” actually does. Whether it's better to change OpenFOAM: API Guide v1912 The open source CFD toolbox Public Member Functions | Protected Member Functions | Protected Attributes | List of all members momentum Class Reference FunctionObjects » Field function objects 13 OpenFOAM is free software: you can redistribute it and/or modify it 13 OpenFOAM is free software: you can redistribute it and/or modify it Sep 5, 2023 · Found a content problem with this page? Submit a bug report Edit source code on GitLab View source code on GitLab Want to get more involved? Learn how to contribute Last updated: Sep 05, 2023 Jun 1, 2021 · All times are GMT -4. g. Sources Detailed Description This group contains finite volume sources Oct 5, 2020 · Dear friends I am using fvOption to add extra momentum in the domain and I use fvOption for this purpose, but It does not work properly. " Steady-state solver for incompressible, turbulent flows. The first is uFVM, a three-dimensional unstructured pressure-based finite volume academic CFD code, implemented within Matlab®. com. Reimplemented in nonlinearEddyViscosity< BasicMomentumTransportModel >, nonlinearEddyViscosity< incompressible::RASModel >, phasePressureModel, and kineticTheoryModel. C The momentum and other fluid properties are of the "mixture" and a single momentum equation is solved. UEqn. I assume that the “momentum source” feature then computes May 19, 2005 · Hi, I'm trying to model air flow through vegetation and need to add a negative source term to the momentum equation in simpleFoam. C multiphaseEuler Class Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation Development openfoam Repository openfoam src fvOptions sources derived fanMomentumSource fanMomentumSource. Free, Open Source Software from the OpenFOAM Foundation About OpenFOAM OpenFOAM is a free, open source CFD software package released free and open-source under the GNU General Public License by the, OpenFOAM Foundation. C Solver details The solver uses the PIMPLE (merged PISO-SIMPLE) algorithm to solve the continuity equation: and momentum equation: Where: 126 const label fieldi 127 ); 128 129 //- Source term to compressible momentum equation 130 virtual void addSup 131 ( 132 const volScalarField & rho, 253 // Explicit momentum source for particle 254 vector Su = Zero; 255 256 // Linearised momentum source coefficient 257 scalar Spu = 0. I would appreciate Oct 16, 2018 · Hello In my simulation, I need to add a rotating source term to momentum equations without modifying the code of the solver. Computes linear/angular momentum, reporting integral values and optionally writing the fields. I modified the solver of Jan 8, 2017 · Overview Category: Incompressible steady state incompressible Turbulence Finite volume options Equations The solver employs the SIMPLE algorithm to solve the continuity equation: ∇∙u = 0 and momentum equation: ∇∙(u ⊗u) −∇∙R = −∇p +Su Where: We would like to show you a description here but the site won’t allow us. Detailed Description Transient solver for incompressible, turbulent flow of Newtonian fluids on a moving mesh. e = m/s^2. Original source file pimpleFoam. You model them as horizontal cylinders providing a fixed momentum or velocity to the fluid. The time now is 02:33. I tried it with the vectorCodedSource term specification as given in the below View Issue DetailsJump to Notes Jump to History Many OpenFOAM applications contain equation systems that can be manipulated at run time via user-specified finite volume options, given by the shorthand fvOptions. I need so to set a driving force inside the domain Return the source term for the momentum equation. By combining the dimensionless velocity Jan 31, 2025 · OpenFOAM version: v2412 Published under: CC BY-NC-SA license (creative commons licenses) Go back to Day 2. Jul 10, 2025 · Dear OpenFOAM community! I am implementing a coupling between my DEM-solver and OpenFOAM via the preCICE coupling library and am currently stuck on an Oct 11, 2011 · hi everybody I'm trying to modify the interFoam equations by adding a source term to the momentum equation, i. Definition at line 119 of file linearViscousStress. To overcome this challenge, solidification-MeltingSource adds source terms to the momentum View Issue DetailsJump to Notes Jump to History Many OpenFOAM applications contain equation systems that can be manipulated at run time via user-specified finite volume options, given by the shorthand fvOptions. Open-Source CFD Course A course at Chalmers University of Technology Taught by Hakan Nilsson Based on OpenFOAM v2112 momentumTransportModel Class Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation 14 OpenFOAM is free software: you can redistribute it and/or modify it The new fanMomentumSource finite-volume option (fvOption) adds a momentum source to represent the action of a fan on the flow. Firstly, the flow rate through the set of upstream faces encompassing the cell zone is calculated. The time now is 15:17. Jul 10, 2025 · In OpenFOAM I have defined a simple fluid-field with an inlet and an outlet. Sep 7, 2019 · All times are GMT -4. MomentumCloud< CloudType > Class Template Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation Apr 10, 2016 · Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Programming & Development Detailed Description Applies an explicit pressure gradient source in such a way to deflect the flow towards an specific direction (flowDir). Sep 6, 2023 · Documentation on using the rotor disk source term in OpenFOAM simulations, including setup and application details. compressibleVoF Class Reference | OpenFOAM | Free, open source CFD software, licensed under the GPL by The OpenFOAM Foundation } 2 The Darcy-Forchheimer Equation The Darcy Forchheimer acts in the momentum equation as a sink term . The second is OpenFOAM®, an open source framework used in the development of a range of CFD programs for the simulation of industrial scale flow problems. As rho is uniform the solver use the kinematic viscosity and a modified pressure : [p/rho] = m^2 / s^2. , von Kármán-type or Kaimal spectra) within the computational domain. The source term in the momentum equation has the dimension of an acceleration i. Alternatively add an extra pressure drop in the flowDir direction using a model. Original source file simpleFoam. Detailed Description Original source file realizableKE. C. More Transient solver for incompressible, turbulent flow of Newtonian fluids on a moving mesh. . For example: type cylindrical; axis (0 0 1); Tutorial: A momentum-source calculator of the actuator-disk model without rotation (ADM-NR) in OpenFOAM to calculate the source terms based on the disk-averaged velocity. The time now is 05:19. OpenFOAM has an extensive range of features to solve anything from complex fluid flows involving chemical reactions Sep 6, 2023 · OpenFOAM documentation - Finite volume optionsIntroduction 🔗 OpenFOAM solver applications typically include core functionality such as turbulence modelling, heat transfer, and buoyancy effects. 12 13 OpenFOAM is free software: you can redistribute it and/or modify it 14 under the terms of the GNU General Public License as published by 15 the Free Software Foundation, either version 3 of the License, or OpenFOAM is free software: you can redistribute it and/or modify it May 30, 2011 · All times are GMT -4. To overcome this challenge, solidification-MeltingSource adds source terms to the momentum Applies an explicit porosity source to the momentum equation within a specified region. Jun 12, 2016 · The meanVelocityForce fvOptions calculates a momentum source so that the volume averaged velocity \eqref {eq:magUbarAve} in the whole computational domain (all) or a part of domain specified using cellSet or cellZone reaches the desired mean velocity Ubar. Further flexibility is offered via fvOptions —a collection of run-time selectable finite volume options to manipulate systems of equations by adding sources/sinks, imposing constraints and applying Nov 30, 2017 · Hi Foamers, I am trying to define a constant source term with the solver pimpleFoam and I use channel395 case to test. C Find file Blame History Permalink Feature: Fan momentum source fvOption based on fan curve · 0f2bbbcb Vuko Vukcevic authored Jun 15, 2023 and Andrew Heather committed Jun 15, 2023 0f2bbbcb Properties 🔗 Variant of the Actuation disk source that includes radial thrust Shows a modified version of the actuatorDisk momentum source which does not use a cellSet in order to mark cells for applying the source. C OpenFOAM solver applications typically include core functionality such as turbulence modelling, heat transfer, and buoyancy effects. Sep 18, 2009 · after spending days in unterstanding the source code and the mathematics of the oodles solver to add a velocity dependend source term to the navier related to 0003464 closed will Unstable packing model in MPPICFoam without the isotropy model This repository provides an OpenFOAM implementation of a momentum source term designed to generate synthetic atmospheric turbulence within the incompressible Navier–Stokes equations. " nl 101"Check whether there are cells in fan momentum source cell zone. 112 hand, the cellZone to which this source term is applied should be composed Feb 25, 2021 · Hi, I'm fairly new to openFoam and I'm trying to simulate a 2D ABL flow over a single turbine and a single sinusoidal hill. I need so to set a driving force inside the domain Steady-state solver for incompressible, turbulent flows. Hello everyody, I'm trying to run a case with cyclic boundary conditions for a two-fluid problem. Further flexibility is offered via fvOptions —a collection of run-time selectable finite volume options to manipulate systems of equations by adding sources/sinks, imposing constraints and applying May 14, 2012 · Hello all, I am trying to run the channel simulation channelFoam from the tutorials with the pressure gradient set by using the new featurei in OF 2. The main important term is the source term which is given as: Original source file compressibleInterFoam.