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Old   May 24, 2008, 02:49
Default PhD dilemma
  #1
shuo
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Hi

I have written a code that is very slow to run. I am considering whether or not to start all over again using other source codes (ie numerica by Toro) or contact the authors of the paper whose method I am trying to implement and asks them nicely for the source code. The paper was published back in 1990 so I am hoping they'll be generous enough to share it.

Your advice is greatly appreciated. Shuo
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Old   May 24, 2008, 03:30
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jinwon park
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You can do well. Do not give up. I also suffered from such failure but recovered soon. Check the line-by-line. You can find bugs you has not realized. If not, you can ask someone else around you. I hope you feel better.
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Old   May 24, 2008, 15:34
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su
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can you tell us what is that paper please ?
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Old   May 24, 2008, 19:26
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shuo
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The paper is "Numerical analysis of gas-particle two-phase flows", R.Ishii, Y.Umeda and M.Yuhi, JFM 203:475-515, 1989. I tried to find the author in the web but hasn't been successful in tracking them down.

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Old   May 25, 2008, 02:53
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rieman
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I strongly suggest you to think of numerica by Toro and to read his book. Also you need to think of having well established mathematical analysis for your case i.e. as in his book (chap 4 - 14). I used the same methodology for compressible two-phase flows.

Please let us know how it goes!

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Old   May 25, 2008, 07:25
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shuo
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Hi rieman

Can you recommend some papers on extending Riemann and upwind solver to multi-phase flows? Also how easy it to extend the methods outlined in Toro's book to the Navier-Stokes equations? I am simulating a supersonic impinging jet and viscosity would play a part for the wall jets.

Cheers shuo
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Old   May 29, 2008, 22:44
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Chin Fook
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Writing a code sometimes may give you a real hassle. Debug your code smartly; meaning check by running them section by section (part by part) in order to figure our which routine actually causes the bottleneck. Anologuous to experimental research, we try to reduce the number of variables at a time just to find out what is the effect of a single variable.

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Old   July 7, 2009, 18:13
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Nishant Kumar
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Hello,

Are there any possibilities to get the NUMERICA code from somewhere?
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Old   July 8, 2009, 09:55
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Cangel W.Tan
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Hey, just send an E-mail to Prof. Toro or send an E-mail to me, and I will give you the NUMERICA codes.
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Old   July 8, 2009, 13:35
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Nishant Kumar
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Hi,

My email address is babuu.nishu@gmail.com
Please send me the codes along with the documentation

Thanks
Nishant
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