PhD dilemma
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 
Re: PhD dilemma
You can do well. Do not give up. I also suffered from such failure but recovered soon. Check the linebyline. You can find bugs you has not realized. If not, you can ask someone else around you. I hope you feel better.

Re: PhD dilemma
can you tell us what is that paper please ?

Re: PhD dilemma
The paper is "Numerical analysis of gasparticle twophase flows", R.Ishii, Y.Umeda and M.Yuhi, JFM 203:475515, 1989. I tried to find the author in the web but hasn't been successful in tracking them down.

Re: PhD dilemma
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 twophase flows.
Please let us know how it goes! 
Re: PhD dilemma
Hi rieman
Can you recommend some papers on extending Riemann and upwind solver to multiphase flows? Also how easy it to extend the methods outlined in Toro's book to the NavierStokes equations? I am simulating a supersonic impinging jet and viscosity would play a part for the wall jets. Cheers shuo 
Re: PhD dilemma
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.

Hello,
Are there any possibilities to get the NUMERICA code from somewhere? 
Hey, just send an Email to Prof. Toro or send an Email to me, and I will give you the NUMERICA codes.

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