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August 3, 2013, 01:43 |
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#21 |
Member
sandy
Join Date: May 2013
Posts: 91
Rep Power: 13 |
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 ? |
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August 3, 2013, 02:38 |
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#22 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,399
Rep Power: 46 |
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. |
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August 5, 2013, 13:29 |
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#23 |
Member
sandy
Join Date: May 2013
Posts: 91
Rep Power: 13 |
Thanks for the help Alex . I will start debug my code and find out any errors that prevents me to go further .
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August 20, 2013, 17:52 |
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#24 | |
Member
sandy
Join Date: May 2013
Posts: 91
Rep Power: 13 |
Quote:
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 . thanks in advance |
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August 21, 2013, 02:26 |
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#25 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,399
Rep Power: 46 |
When you say your results are over-predicted, what exactly do you mean?
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August 21, 2013, 02:29 |
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#26 |
Member
sandy
Join Date: May 2013
Posts: 91
Rep Power: 13 |
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)
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October 13, 2013, 23:46 |
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#27 | |
Member
sandy
Join Date: May 2013
Posts: 91
Rep Power: 13 |
Quote:
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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