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Old   November 11, 2003, 16:13
Default Help density dependence
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I have a problem when solving for a flow inside a large tank. The dimension is 30 m in height, and a diameter of 20 m. The fluid is seawater. Temperature at the top of the tank is 279 K and at the bottom 276 K. There is a density different between top and bottom of 3 kg. Density top is 1024 kg/m3 and at the bottom it is 1027 kg/m3. Since the tank is 30 meters in height the is also the hydrostatic pressure.

I have define a fluid with the properties of water and a new density. The density and temperature field is set as initial conditions.

How should I set this correctly. It seems like I do not get a stabel solution the temperature field and density field is moving around

Thanks a lot in advance.



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Old   November 25, 2003, 21:30
Default Re: Help density dependence
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You can open the expression editor , edit the function Density To Temperature and High(Pressure),Then select the Expr. button, the last type the name of the function Density to the temperature and the pressure
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