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total pressure drop and momentum source setting

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Old   July 25, 2008, 05:58
Default total pressure drop and momentum source setting
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Li
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I am doing simulations about the pressure drop through a vavle in CFX11.0. The simulations are quite smaller than the experiments. It is becoming worse after I refined the mesh. I don't know why. I calculated the total pressure using this equation: massflowave(total pressure)@location and get the pressre drop between the inlet and outlet. Would you give me any hints to improve the simulations? I use k-e model and I am sure the results are converged at 1.0E-5 with max residual.

As to momentum source setting, I had a look at the help documents. I am not sure that I understood them well. Is that true that isotropical loss model and directional loss model are used in porous resistence? In my case, should I use the general momentum source if I want to try another way to do the simulations.

If you have any suggestions, please tell me. Thank you very much!
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Old   July 25, 2008, 11:44
Default Re: total pressure drop and momentum source settin
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brunoc
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Li,

Monitoring total pressure gives you how much energy the fluid lost through your device. Pressure drops are usually measured in terms of Static Pressure.

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Old   July 28, 2008, 02:33
Default Re: total pressure drop and momentum source settin
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Li
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Hi Brunoc, thank you for your reply.
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