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Old   January 12, 2012, 23:54
Default isotropic homogeneous turbulent flow field
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Hello!

For a project I need a downloadable CFD code that simulates a isotropic homogeneous turbulent flow field. Also I would be happy with just data form DNS or other simulations, because I need the velocity field to model a combustion. Does anyone of you know where I could get something like that?

Thanks!
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Old   January 16, 2012, 11:06
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http://www.amazon.co.uk/Fluid-Flow-P...6726231&sr=8-1

The accompanying CD has a spectral code on it, however the book is really expensive and I found it to be not too good.

The generation of valid HIT data can be a real pain in the neck, so seems like a big project you are working on!

cheers and good luck, I'll be happy to help any further!
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Old   January 16, 2012, 11:13
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Openfoam has some tutorial with it.

BUT, given that DNS requires tons of cpu time to get some results, maybe could be more cost-effective to search the literature for the results.
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Old   January 17, 2012, 02:57
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Thanks a lot!
@cfdnewbie: Is this a 3D HIT on the CD in that book?
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Old   January 17, 2012, 09:53
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yes, from a given E(k) spectrum using Rogallo's procedure (if that means anything to you....)
need more help?

cheers!
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Old   January 17, 2012, 20:50
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Yes I came across rogallos code during my literature research. Could I get a suitable velocity field out of it and in what form is the velocity field supplied? You're a great help, thank you!
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Old   January 18, 2012, 07:41
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Well, you will get an incompressible (i.e. div free) u,v,w field from that, but I guess you would have to compute the pressure from that via a poisson equation.... I'm not sure if an incompressible field is what you are looking for, I know there are some methods to get a compressible field from an incompressible one (one by G. Blaisdell).

The code is available as source code (F77, I think), so you can just modify it in any way for your output requirements.
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Old   January 25, 2012, 23:06
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Quote:
Originally Posted by cfdnewbie View Post
Well, you will get an incompressible (i.e. div free) u,v,w field from that, but I guess you would have to compute the pressure from that via a poisson equation.... I'm not sure if an incompressible field is what you are looking for, I know there are some methods to get a compressible field from an incompressible one (one by G. Blaisdell).

The code is available as source code (F77, I think), so you can just modify it in any way for your output requirements.
Okay, I decided to try to work with that code. But before I buy the book, can you tell me:

Can I generate a 100^3, 200^3 and maybe 400^3 grid velocity field with multiple time steps? And how long would the code run for a time step?
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