Hello everybody I am simulating a heptane combustion via sprayFoam (OF 5.x) Can anyone tell me what's this error for?
--> FOAM FATAL ERROR: Integration steps greater than maximum 10000xStart = 0, xEnd = 5.53853e-08, x = 4.02297e-08, dxDid = 2.29093e-12
From function virtual void Foam::ODESolver::solve(Foam::scalar, Foam::scalar, Foam::scalarField&, Foam::scalar&) constin file ODESolvers/ODESolver/ODESolver.C at line 191. FOAM exiting
I get this error at time=0.0008 s then I stopped the simulation and just rerun the simulation, it continued till time=0.00108 then again I get the same error!📷
Mixed-type functional differential equations: A numerical approach
@ Jula Kabeto Bunkure : What do you mean by this? what's the solution?
Dear Sadegh
I believe that this error is because of great number of utilized time step. When you start SPRAYING the fuel, the physic or the phenomena is considered as turbulent condition due to Grashoff Number. (Gr > 1e10).
Try smaller Time Step and report the outcomes.
BR
Yasin Salami
@Yasin Salami: Dear Yasin thanks for your reply. I'm using modifiable time steps with a courant number of 0.1 (I mean OpenFOAM adjusts the time steps)
Then you mean I should reduce my courant number?
May it be related to my mesh?
If you see that by decreasing the time step (whether via software or by yourself) the problem is not killed, reduction of courant number can be a way to overcome this obstacle.
Is your mesh generated via a special software? What is different about that?
@Yasin Salami: Dear Yasin I decreased my courant number down to 0.05 and my simulation continued from 0.023 to 0.0313s. But after that again this error shows up! I don't know what's wrong?!
My geometry is a 30 degree sector of a cylinder (length:108mm, diameter:54mm). I had some difficulties meshing the corner of this geometry. Finally to obtain a geometry with good skewness ratio I decided to mesh the corner unstructured.
You can see my mesh in the attachment.
Have you tried changing you chemistry solver in the chemistryProperties dictionary? I would recommend using "ode" (Rosenbrock34). Please let me know if you have already solved this problem.
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