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-   -   Does star cd takes reference pressure? (http://www.cfd-online.com/Forums/cd-adapco/56007-does-star-cd-takes-reference-pressure.html)

monica April 19, 2007 09:24

Does star cd takes reference pressure?
 
Pls let me know that does star cd take any reference pressure like cfx or fluent or not? I am a new user of star cd. I also cudnt get concept of cell monitoring and reference data for cell. Awaiting ur response.

ping April 19, 2007 11:26

Re: Does star cd takes reference pressure?
 
From the FAQ's at www.adapco-online.com

What is the reference pressure?

The reference pressure is used to maximize the precision of calculated pressure gradients.

All pressure values stored in the .pst file and in internal arrays are stored relative to the reference pressure for each material type.

All input requested by the user interface for pressures will be relative to the reference pressure.

Calculations within the code that are dependent on absolute pressures use the stored relative pressure added to the reference pressure.

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How does the value of the reference pressure influence the analysis?

Models that contain no pressure boundaries:

Any fluid stream in a steady state analysis that contains no pressure boundaries will "pin" the pressure field such that the relative pressure at the pressure reference cell is identically zero. i.e. the absolute pressure at the pressure reference cell will be the reference pressure.

Models that contain pressure boundaries:

Any fluid stream in a steady state analysis that does contain a pressure boundary or any transient analysis will not "pin" the pressure at the reference cell. However the pressure at the reference cell and all other cells is still stored relative to the reference pressure. i.e. the absolute pressure at the pressure reference cell will be the stored relative pressure plus the reference pressure.



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