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-   -   stagnation pressure boundary problem (http://www.cfd-online.com/Forums/star-cd/72154-stagnation-pressure-boundary-problem.html)

mbgnfrx2 January 27, 2010 09:15

stagnation pressure boundary problem
 
Hi everyone,

I am simulating a simple case with a inlet and a outlet, using stagnation pressure boundary condition for inlet and pressure boundary for outlet. However, I cannot figure out why star-cd always tell me "Error 012: Static pressure greater than stagnation pressure at region 1 negative. Try to lower relaxation factor for pressure and/or velocities." The stagnation pressure is set as 1000 at the inlet, with outlet pressure 0. There is no other way to setup the boundaries any more, as we only know the inlet and outlet pressure.


Many thanks in advance!

immortality November 23, 2012 20:48

hello
I have this problem now.How did you solve this problem finally?

LuckyTran November 26, 2012 00:55

Quote:

Originally Posted by immortality (Post 393919)
hello
I have this problem now.How did you solve this problem finally?

Check your calculations to make sure you have the appropriate Inlet Total Pressure.

You need to know indirectly, static pressure (also called supersonic static pressure), total pressure, mach number, static temperature, and total temperature (3 of these 5).


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