[Jay22kar]

Hello guys, I am doing a simulation using rhoCentralFoam solver.
The automatic time-step-adjustment is on & max Courant no is set to 0.5.
Here's the controlDictfile -

application rhoCentralFoam;
startFrom startTime;
startTime 0;
stopAt endTime;
endTime 1;
deltaT 0.005;
writeControl adjustable;
writeInterval 0.25;
purgeWrite 0;
writeFormat ascii;
writePrecision 6;
writeCompression off;
timeFormat general;
timePrecision 6;
runTimeModifiable true;
adjustTimeStep yes;
maxCo 0.5;
maxDeltaT 1;

The simulation stopped at 0.77s with max Courant no. of 1.29 -

Mean and max Courant Numbers = 0.367752 1.29425
deltaT = 0.000507891
Time = 0.775512
diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterations 0
diagonal: Solving for rhoUx, Initial residual = 0, Final residual = 0, No Iterations 0
diagonal: Solving for rhoUy, Initial residual = 0, Final residual = 0, No Iterations 0
diagonal: Solving for rhoE, Initial residual = 0, Final residual = 0, No Iterations 0
ExecutionTime = 19.85 s ClockTime = 21 s

Can anyone please help me, I don't know what's going on here?

PS - Earlier, I set the max Courant no. to 0.9 in controlDict & the simulation stopped at 0.008s with showing max courant no. as 14.5
I guess, as I decrease the maxCourant in controlDict, it solves more timestep but never 100%

[Jay22kar]

Same thing is happening with the default tutorial provided by OpenFOAM.

If you run compressible/rhoCentralFoam/forwardstep tutorial just by changing the maxCo to 0.9, the simulation stops after few iterations.

Is the solution converging?
Is that why is it stopping without any error?

Can anyone please explain what's exactly happening behind the lines?

[HPE]

Hi,

Could you please open a bug ticket, if possible?

Thank you!

[Jay22kar]

Hello HPE,
I am quite new to OpenFOAM.
So I don't exactly understand what "opening a bug ticket" means.

Also, do you think, it's a bug?
I think it has just something to residuals, timestep or Courant number..

Thanks for replying

[geth03]

how come that your intial residuals are zero?

[Jay22kar]

@geth

Hello, I guess, it ha something to do with diagonal solver.
Its the same when running a tutorial case.