Is pressure-based solver adequate for a transient simulation ?

y__tb · May 23, 2022, 22:28

Hi guys, I need some advice on an adequate solver setting to simulate transient flow.

I’m trying to simulate a high-pressure pneumatic valve flow for 2 seconds, which is quite short.
The overall flow speed would not become over Mach 3.
Since some geometries are moving, a dynamic mesh would also be necessary.
Would there be any standard for setting a solver and schemes?

I’m trying to use a pressure-based solver and standard k-e turb model with a small time-step (1e-6 ~ 1e-7). Max iter would be a default, 20.

But, I’m concerned about using a pressure-based solver, which is implicit, when simulating such shot time transient simulation.

Any advice? Thanks for all.

LuckyTran · May 23, 2022, 23:15

The smaller the time-step, the more it makes sense to use a pressure-based solver over a density-based one. I've also used a pressure-based solver for Mach numbers greater than 5 and found no issues. I don't have any advice except to tell you that the pressure based solver works for transient problems.

May 23, 2022, 22:28	Is pressure-based solver adequate for a transient simulation ?	#1
y__tb New Member y t b Join Date: May 2022 Posts: 3 Rep Power: 3	Hi guys, I need some advice on an adequate solver setting to simulate transient flow. I’m trying to simulate a high-pressure pneumatic valve flow for 2 seconds, which is quite short. The overall flow speed would not become over Mach 3. Since some geometries are moving, a dynamic mesh would also be necessary. Would there be any standard for setting a solver and schemes? I’m trying to use a pressure-based solver and standard k-e turb model with a small time-step (1e-6 ~ 1e-7). Max iter would be a default, 20. But, I’m concerned about using a pressure-based solver, which is implicit, when simulating such shot time transient simulation. Any advice? Thanks for all.

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May 23, 2022, 23:15		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	The smaller the time-step, the more it makes sense to use a pressure-based solver over a density-based one. I've also used a pressure-based solver for Mach numbers greater than 5 and found no issues. I don't have any advice except to tell you that the pressure based solver works for transient problems.