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Mat. prop. vs Temperature curve approximation

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Old   March 14, 2006, 08:07
Default Mat. prop. vs Temperature curve approximation
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I want to use the "Expressions" part in the CFX Pre to determine for instance the density vs temperature curve of water! I divided the whole curve in two part and I tried to approximate them by 5th and 6th order polinomes but between the measured points there are unplesaent oscillation! I think (and I experienced too)they cause inconvergency? What sould I do? How can I complete this problem?

Thanks in advence!

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