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Supersonic/Inlet Gauge Pressure

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Old   April 23, 2010, 05:20
Post Supersonic/Inlet Gauge Pressure
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Xavier Ekka
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Hi
I am Xavier and i am new to fluent.I am currently using fluent for the analysis of nozzle.Where i am confused what to enter the value for supersonic/inlet gauge Pressure in boundary condition.I am currently using this tutorial http://courses.cit.cornell.edu/fluent/nozzle/index.htm for fluent analysis of nozzle.
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Old   April 27, 2010, 08:17
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Leonardo Giampani Morita
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This is only a first guess for the static pressure and normally it should not affect your results, so you can use an arbitrary value. However a good guess can help with convergence issues...
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Old   April 28, 2010, 03:47
Post supersonic/inlet gauge pressure
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Xavier Ekka
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Many people have said they same thing you did it is right for small pressure range(I think) .But when you go little higher say 12 bar then what ever value i am putting in supersonic/inlet gauge pressure either it gives floating point error or divergence detected.So i am guessing it is due to wrong value in supersonic/inlet gauge pressure.
Can you help me why this error?

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Old   April 28, 2010, 04:01
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Leonardo Giampani Morita
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hmm...honestly I've never done this kind of simulation, but I can suggest you to try a good initialization for your whole domain...and also to recheck all your boundary conditions
good luck
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inlet gauge pressure, nozzle flow, supersonic

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