confusion about the unsteady solver

ztdep · March 22, 2020, 23:56

I have noticed that in OpenFoam, both the simpleFoam and pisoFoam solve UVW equation in each time step only once, I don't understand the reason.
We should solve UVW and pressure iteratively in each time step many times.
Could you please give me some answers.
Regards

cryabroad · March 23, 2020, 08:32

simpleFoam is a steady state solver. pisoFoam, as you mentioned, solves the velocity and then correct the pressure multiple times (2 to 3). The algorithm you mentioned is implement ed in pimpleFoam.

March 22, 2020, 23:56	confusion about the unsteady solver	#1
ztdep Senior Member p ding Join Date: Mar 2009 Posts: 436 Rep Power: 20	I have noticed that in OpenFoam, both the simpleFoam and pisoFoam solve UVW equation in each time step only once, I don't understand the reason. We should solve UVW and pressure iteratively in each time step many times. Could you please give me some answers. Regards

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March 23, 2020, 08:32		#2
cryabroad Senior Member Ruiyan Chen Join Date: Jul 2016 Location: Hangzhou, China Posts: 162 Rep Power: 10	simpleFoam is a steady state solver. pisoFoam, as you mentioned, solves the velocity and then correct the pressure multiple times (2 to 3). The algorithm you mentioned is implement ed in pimpleFoam.