# Navier stokes and maxwell slip boundary

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 August 3, 2013, 01:43 #21 Member   sandy Join Date: May 2013 Posts: 80 Rep Power: 6 Mr.Alex, The boundary conditions look correct in the way you said . May be the Maccormack method which i wrote is responsible for the errors i guess. Have you tried implementing this with the navier stokes ? . If so could you check on my entire code ?

 August 3, 2013, 02:38 #22 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,534 Rep Power: 25 For NS, i only have a small 1-dimensional (+incompressible +isothermal) code with finite differences. I guess you will have to go the usual way by debugging your code step by step.

 August 5, 2013, 13:29 #23 Member   sandy Join Date: May 2013 Posts: 80 Rep Power: 6 Thanks for the help Alex . I will start debug my code and find out any errors that prevents me to go further .

August 20, 2013, 17:52
#24
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sandy
Join Date: May 2013
Posts: 80
Rep Power: 6
Quote:
 Originally Posted by flotus1 For NS, i only have a small 1-dimensional (+incompressible +isothermal) code with finite differences. I guess you will have to go the usual way by debugging your code step by step.
Mr.Alex ,

I recently found that my code over predicts the results . Could you help me with this ? . I dont know what is wrong with this . The results for no slip condition too is over predicted for certain plots .

 August 21, 2013, 02:26 #25 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,534 Rep Power: 25 When you say your results are over-predicted, what exactly do you mean?

 August 21, 2013, 02:29 #26 Member   sandy Join Date: May 2013 Posts: 80 Rep Power: 6 I get exactly same graphs as in t book . but slight variation in t peak values . For example , p/pinf =1.45 (from book) , p/ping=1.6 (from my code)

October 13, 2013, 23:46
#27
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sandy
Join Date: May 2013
Posts: 80
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Quote:
 Originally Posted by flotus1 For NS, i only have a small 1-dimensional (+incompressible +isothermal) code with finite differences. I guess you will have to go the usual way by debugging your code step by step.
Mr Alex ,

This is the temperature plot i got for Kn=0.0156 . But when i tried the same method with kn=0.0723 . It just blows away giving complex numbers . after 7 steps. But actually this range of knudsen number falls into slip regime right ? The input conditions are as follows

Alt=10km

Pinf=2.65e4;
T=223.2625;
Kn=0.0156

Alt=20km
Pinf=5.523e3;
T=216.65
kn=0.0723
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