Hi: I am a new user of OpenF
 

Hi:
I am a new user of OpenFoam,I have some questions about OpenFoam:
1)when I run sonicFoam/forwardstep case,I change the initial internal U field from (0,0,0) to (3,0,0),why the calculation became divergence?
2)I want a calculation with sonicTurbFoam to keep the CoNum constant instand of DeltaT constant ,how can I do this?

Hi, I did 2) in the follow
 

Hi,

I did 2) in the following way:
added the following line to the code after calculating CoNumber (# include CourantNo.H)

alfat = CFL/CoNum;
runTime.setDeltaT(alfat*runTime.deltaT().value());

Obviously, alfat had been previously defined as scalar and CFL was read from a file (defined as float).

Cheers,
Luiz

Sampaio Thanks for your help
 

Sampaio
Thanks for your help.It works fine.

You should be aware that Open
 

You should be aware that OpenFOAM already has a mechanism for maintaining a steady maximum CFL number.

See the dambreak tutorial and interFoam solver for details.

Eugene