[manuc]

Hello

I have a new solver with structure of chtMultiregionfoam which behaves like bouyantboussinesqpimplefoam for fluid region. I ran the simulations in series and the solution converges. When I try to run it in parallel it crashes in the first step.
Used OF2.4.0


I tried to reduce the courant number to attain initial stability , but then the solver crashes after 2nd time step.

:
Test1

deltaT = 4.5530327e-107
Test2

--> FOAM Warning : 
From function Time::operator++()
in file db/Time/Time.C at line 1061
Increased the timePrecision from 62 to 63 to distinguish between timeNames at time 2.0707573e-07
Time = 2.07075734119138104400662664383858668770699296146631240844726562e-07


Solving for fluid region air
DILUPBiCG: Solving for T, Initial residual = 0.010403611, Final residual = 2.7324966e-12, No Iterations 1
max(T) [0 0 0 1 0 0 0] 300.02011
DICPCG: Solving for p_rgh, Initial residual = 1, Final residual = 0.0099236724, No Iterations 251
time step continuity errors : sum local = 5.0400286e-07, global = 1.0693134e-19
--------------------------------------------------------------------------
mpirun noticed that process rank 4 with PID 17152 on node n11-42 exited on signal 8 (Floating point exception).

(I tried different decomposing methods (simple and scotch)..Also I varied simple coeff --delta-0.01 ...but no use))


Could someone help to identify if its a fvSolution setting issue. I tried GAMG with DIluGaussSeidel for U, PCG for Temperature in the fvSlution. I am stuck for more than a month Couldnt find any suggestions in the forum helping me..


problem solved:
Temperature anomoly at pressure reference cell