[joco]

Hi

I ran the simulation included with the files "make fish swim". I increased the size of the background mesh, and inserted a different fish model. When it runs it exits without any error. Here is the output of the process:

jo5117@SCCO-D-CASTRO:~/OpenFoam/Fish/Fish_MyDolphin_3$ pimpleDyMFoam
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1706                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : v1706-17752679325a
Arch   : "LSB;label=32;scalar=64"
Exec   : pimpleDyMFoam
Date   : Feb 07 2023
Time   : 10:50:17
Host   : "SCCO-D-CASTRO"
PID    : 4969
Case   : /mnt/d/Working/OpenFoam/Fish/Fish_MyDolphin_3
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

Selecting dynamicFvMesh dynamicMotionSolverFvMesh
Selecting motion solver: displacementLaplacian
Selecting motion diffusion: quadratic
Selecting motion diffusion: inverseDistance
Selecting patchDistMethod meshWave

PIMPLE: no residual control data found. Calculations will employ 2 corrector loops

Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting turbulence model type laminar
Selecting laminar stress model Stokes
No MRF models present

Reading/calculating face velocity Uf

No finite volume options present

Courant Number mean: 0.208911 max: 6.34079

Starting time loop

Courant Number mean: 0.208911 max: 6.34079
Time = 0.01

GAMG:  Solving for cellDisplacementx, Initial residual = 0, Final residual = 0, No Iterations 0
GAMG:  Solving for cellDisplacementy, Initial residual = 0, Final residual = 0, No Iterations 0
GAMG:  Solving for cellDisplacementz, Initial residual = 1, Final residual = 1.27876e-17, No Iterations 1
GAMG:  Solving for pcorr, Initial residual = 1, Final residual = 9.95307e-07, No Iterations 646
time step continuity errors : sum local = -4.16827e-08, global = -1.54015e-12, cumulative = -1.54015e-12
PIMPLE: iteration 1
smoothSolver:  Solving for Ux, Initial residual = 1, Final residual = 0.0560693, No Iterations 4
smoothSolver:  Solving for Uy, Initial residual = 1, Final residual = 0.0562306, No Iterations 4
smoothSolver:  Solving for Uz, Initial residual = 1, Final residual = 0.0572626, No Iterations 4
jo5117@SCCO-D-CASTRO:~/OpenFoam/Fish/Fish_MyDolphin_3$

Any help is reallly appreciated.
Best wishes.
/Joc

[nikoscham]

I see that the Courant number is large. I propose to decrease the initial time step and also reduce the Courant number max limit.


All the best
Nikos