|
[Sponsors] |
October 10, 2023, 08:39 |
[momentumPredictor] Frozen velocity field
|
#1 |
New Member
Dasha
Join Date: Sep 2023
Posts: 14
Rep Power: 2 |
Hello everyone,
Can someone tell me how to turn off the equations for the momentum for "foamMultiRun"? I calculated the pre-initiated field of velocities and pressures. Now I want to calculate my case with only heat transfer. I turned off the flow equations in fvSolution. When I start running the case, the velocity are not calculated in residuals, but the velocity field still changes. Please someone tell me what could be the problem? fvSolution: Code:
PIMPLE { flow off; momentumPredictor off; nOuterCorrectors 30; nCorrectors 1; nNonOrthogonalCorrectors 0; ... Code:
thermoType { type heRhoThermo; mixture pureMixture; transport const; thermo eConst; equationOfState rPolynomial; specie specie; energy sensibleInternalEnergy; } mixture { specie { molWeight 18.015; } equationOfState { rho0 1000; T0 278; //beta 2e-04; C (0.001278 -2.1055e-06 3.9689e-09 4.3772e-13 -2.0225e-16); } Code:
wedge0_rotated diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 wedge0_rotated DILUPBiCGStab: Solving for e, Initial residual = 0.000680102566017, Final residual = 5.34837357105e-05, No Iterations 1 wedge0_rotated DICPCG: Solving for p_rgh, Initial residual = 0.00296039703522, Final residual = 9.69628888453e-09, No Iterations 595 wedge0_rotated diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0 wedge0_rotated time step continuity errors : sum local = 1.40253056235e-10, global = -7.49192173107e-13, cumulative = -8.68144446708e-09 |
|
November 6, 2023, 08:26 |
|
#2 |
New Member
Join Date: Mar 2022
Posts: 7
Rep Power: 4 |
Hi, make a minIter 0 for fluid in fvSolution, except for pressure (but I'm not sure)
|
|
November 15, 2023, 05:56 |
|
#3 |
New Member
Dasha
Join Date: Sep 2023
Posts: 14
Rep Power: 2 |
After testing different configurations, I would like to share my observations and conclusions:
The problem was in the equations of state. I considered a compressible fluid in my case, which is why the velocity field could not remain the same as in the case of an incompressible fluid. So I came to the conclusion that we cannot simultaneously consider a compressible fluid and an unchanging field of velocities and pressures. |
|
Tags |
frozen flow, momentum equation, velocity field |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Foam::error::PrintStack | almir | OpenFOAM Running, Solving & CFD | 91 | December 21, 2022 04:50 |
Import .csv - velocity profile - error | eSKa | CFX | 9 | April 3, 2021 13:38 |
potential flows, helmholtz decomposition and other stuffs | pigna | Main CFD Forum | 1 | October 26, 2017 08:34 |
importing velocity field instead of solving | amin.enr | OpenFOAM Running, Solving & CFD | 0 | November 10, 2015 15:55 |
Finely dispersed particles in predetermined velocity field | BrainDebugger | STAR-CCM+ | 1 | May 14, 2014 06:32 |