how to set the static pressure and total pressure

Springyuu · May 31, 2021, 08:32

Hi, I'm doing a simulation that the air of 0.28 MPa flow into a tank of 100 Pa. There is a supersonic flow during the air flow. I choose the supersonic flow regime for the inlet boundary, and set the static pressure to 100 Pa and total pressure to 0.28 MPa due to the velocity is unknown.
however, I found that when the static pressure is 100 Pa, 200 Pa and other different values, the calculated mass flow rate on the inlet surface is different, respectively 0.0021 kg/s, 0.0034 kg/s, which are not in accordance with a formula. I also try to set the static pressure 0.28 MPa, but there is an error occurred that fatal overflow in linear solver.
So I wonder how should I set the static pressure and total pressure. if the static pressure should be set to 0.28 MPa, how to adjusting the settings. I will be very grateful if you can provide any suggestions. Thanks a lot!

ghorrocks · May 31, 2021, 20:07

Before you start drawing conclusions about your results, have you confirmed you have reduced numerical errors sufficiently that the results are meaningful?

See FAQ: https://www.cfd-online.com/Wiki/Ansy..._inaccurate.3F

May 31, 2021, 08:32	how to set the static pressure and total pressure	#1
Springyuu New Member Springyuu Join Date: Nov 2019 Posts: 13 Rep Power: 6	Hi, I'm doing a simulation that the air of 0.28 MPa flow into a tank of 100 Pa. There is a supersonic flow during the air flow. I choose the supersonic flow regime for the inlet boundary, and set the static pressure to 100 Pa and total pressure to 0.28 MPa due to the velocity is unknown. however, I found that when the static pressure is 100 Pa, 200 Pa and other different values, the calculated mass flow rate on the inlet surface is different, respectively 0.0021 kg/s, 0.0034 kg/s, which are not in accordance with a formula. I also try to set the static pressure 0.28 MPa, but there is an error occurred that fatal overflow in linear solver. So I wonder how should I set the static pressure and total pressure. if the static pressure should be set to 0.28 MPa, how to adjusting the settings. I will be very grateful if you can provide any suggestions. Thanks a lot!

May 31, 2021, 20:07		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Before you start drawing conclusions about your results, have you confirmed you have reduced numerical errors sufficiently that the results are meaningful? See FAQ: https://www.cfd-online.com/Wiki/Ansy..._inaccurate.3F __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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