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define a new compressible material in cfx

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Old   May 7, 2021, 04:22
Default define a new compressible material in cfx
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Hi, researchers.
I want to get a compressible liquid(like water at 34C), and the density can vary with absolute pressure. It's based on the Tait equation. What should I do? Should I use the expression method? additional variables? or the used function?
Waiting for your reply. Thanks a lot.
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Old   May 7, 2021, 04:25
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Quote:
Originally Posted by Zhuhan View Post
Hi, researchers.
I want to get a compressible liquid(like water at 34C), and the density can vary with absolute pressure. It's based on the Tait equation. What should I do? Should I use the expression method? additional variables? or the used function?
Waiting for your reply. Thanks a lot.
Tip:
Here is my cel code.

N=7.1
D water=994.331[kg m^-3]
B=300[MPa]
stem 1=((Absolute Pressure+B)/(Psat+B))^(-N)
D l=D water*stem 1
Psat = 0.0532506[bar]
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Old   May 10, 2021, 14:49
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That may work, but why not just use the built in IAPWS IF97 Library material properties for water?
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