[HamzauTT]

Hello,
I'm trying to solve a static equation in OpenFOAM (without time derivatives). Initially, I removed the time derivative from the scalarTransportFoam solver and the simple time loop with no results. I also tried retaining the time loop and running the simulation for one step, yet didnt work either. I'm seeking assistance here to know whether anyone is aware of a static solver (no time derivative term in the equation) within OpenFOAM that I could potentially adapt for my specific case.

[olesen]

Originally Posted by HamzauTT

Hello,
I'm trying to solve a static equation in OpenFOAM (without time derivatives). Initially, I removed the time derivative from the scalarTransportFoam solver and the simple time loop with no results. I also tried retaining the time loop and running the simulation for one step, yet didnt work either. I'm seeking assistance here to know whether anyone is aware of a static solver (no time derivative term in the equation) within OpenFOAM that I could potentially adapt for my specific case.

laplacianFoam? It doesn't get much simpler than that.

[HamzauTT]

I checked laplacian foam and it seems to have a time loop.

[dlahaye]

laplacianFoam does indeed have a while(simple.loop()).

See e.g. line 85 of https://develop.openfoam.com/Develop...aplacianFoam.C

Even if ddtSchemes in systems/fvSchemes is set steadySteady, the loop remains (most obviously).

Two possible scenarios exist.

1/ The source term is linear in the state variable solved for, and the residual of the SIMPLE iteration drops to a very small number in only one iteration. Only one iteration is required.

2/ The source term is non-linear in the state variable solved for, and various iterations are required to bring the residual of the SIMPLE iteration to a small number.

[HamzauTT]

The simulation does indeed stop after the first iteration.But it does not provide any notification of the solving process for that iteration, and I do not receive any output.

[dlahaye]

Copy and paste here output from terminal that you receive.

[HamzauTT]

Here is it and thanks for helping:


Create time

Create mesh for time = 0


SIMPLE: no convergence criteria found. Calculations will run for 1 steps.

Reading field T

Reading field U

Reading transportProperties

Reading diffusivity DT

Reading/calculating face flux field phi

No finite volume options present

Calculating scalar transport

Courant Number mean: 0.0495 max: 0.0495
Time = 0.001

hamza469@DESKTOP:~/1D$

[dlahaye]

Thanks.

Pls share controlDict, fvSolution and fvSchemes.

[HamzauTT]

Thank you for your help. The steadyState option is indeed more practical than modifying the solver. I figured out that my mistake was that the boundary conditions were not defined correctly.