Pressure Velocity Coupling Method in Supersonic Regime?

waseeqsiddiqui · November 27, 2018, 08:02

Is it good practice to use pv coupled method in supersonic mach 2.3?
The results obtained are much faster than Density based!

LuckyTran · November 27, 2018, 10:01

It's not a bad idea. I would do it. Makes sense. Actually I often don't even use COUPLED but go straight to SIMPLE, it's even faster.

waseeqsiddiqui · November 27, 2018, 10:28

I think you are being sarcastic

waseeqsiddiqui · November 27, 2018, 10:46

So we use the same equations in a sequential manner in simple, in a coupled manner at the same time excluding energy in PV coupled and all together in density. What Mach margin is decided by standard or engineering judgement supporting PV Coupling?

LuckyTran · November 27, 2018, 15:34

They all work. It is a big min/max optimization of stability vs cost. The vanilla density-based solver is unstable in the zero Mach number limit, but pre-conditioners are used to stabilize it. High mach number flows are a piece of cake.

waseeqsiddiqui · November 27, 2018, 21:27

Perfect. Thanks.

November 27, 2018, 08:02	Pressure Velocity Coupling Method in Supersonic Regime?	#1
waseeqsiddiqui Member MWRS Join Date: Apr 2018 Location: Islamabad Posts: 99 Rep Power: 8	Is it good practice to use pv coupled method in supersonic mach 2.3? The results obtained are much faster than Density based!

November 27, 2018, 10:01		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	It's not a bad idea. I would do it. Makes sense. Actually I often don't even use COUPLED but go straight to SIMPLE, it's even faster. waseeqsiddiqui likes this.

November 27, 2018, 15:34		#5
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	They all work. It is a big min/max optimization of stability vs cost. The vanilla density-based solver is unstable in the zero Mach number limit, but pre-conditioners are used to stabilize it. High mach number flows are a piece of cake. waseeqsiddiqui likes this.

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November 27, 2018, 10:28		#3
waseeqsiddiqui Member MWRS Join Date: Apr 2018 Location: Islamabad Posts: 99 Rep Power: 8	I think you are being sarcastic

November 27, 2018, 10:46		#4
waseeqsiddiqui Member MWRS Join Date: Apr 2018 Location: Islamabad Posts: 99 Rep Power: 8	So we use the same equations in a sequential manner in simple, in a coupled manner at the same time excluding energy in PV coupled and all together in density. What Mach margin is decided by standard or engineering judgement supporting PV Coupling?

November 27, 2018, 21:27		#6
waseeqsiddiqui Member MWRS Join Date: Apr 2018 Location: Islamabad Posts: 99 Rep Power: 8	Perfect. Thanks.