# stagnation pressure boundary problem

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 January 27, 2010, 09:15 stagnation pressure boundary problem #1 New Member   Join Date: Mar 2009 Posts: 7 Rep Power: 8 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!

 November 23, 2012, 20:48 #2 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,205 Rep Power: 17 hello I have this problem now.How did you solve this problem finally?

November 26, 2012, 00:55
#3
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Lucky Tran
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Quote:
 Originally Posted by immortality 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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