Pressure and Density-based

jojoora · April 16, 2016, 02:15

Hi,
I have a question about Pressure and Density based.
I would made the supersonic flow simulation so I choose Density-based. If I choose density-based, my ram were always working on 100% after initializing the solution, but if I chose Pressure-based, it works around 10%.
My computer's ram has 32 G.
I had checked my mesh quality. It's well.

LuckyTran · April 18, 2016, 14:28

By 10%/100% are you referring to RAM capacity usage (in MB/GB) or RAM access speed?

The density base solver generally should only need 2x the memory of the pressure based solver. I honestly have never encountered a problem where the memory increased by more than 10x.

The density based solver solves coupled and these can more easily be accelerated. However, a 10x speed increase is still surprising unless there is a large disparity between your cpu and ram speeds cause by your hardware.

April 16, 2016, 02:15	Pressure and Density-based	#1
jojoora New Member yu lin chen Join Date: Apr 2016 Posts: 5 Rep Power: 0	Hi, I have a question about Pressure and Density based. I would made the supersonic flow simulation so I choose Density-based. If I choose density-based, my ram were always working on 100% after initializing the solution, but if I chose Pressure-based, it works around 10%. My computer's ram has 32 G. I had checked my mesh quality. It's well.

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April 18, 2016, 14:28		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 66	By 10%/100% are you referring to RAM capacity usage (in MB/GB) or RAM access speed? The density base solver generally should only need 2x the memory of the pressure based solver. I honestly have never encountered a problem where the memory increased by more than 10x. The density based solver solves coupled and these can more easily be accelerated. However, a 10x speed increase is still surprising unless there is a large disparity between your cpu and ram speeds cause by your hardware.