isotropic homogeneous turbulent flow field

Matthias89 · January 12, 2012, 22:54

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!

cfdnewbie · January 16, 2012, 10:06

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!

sail · January 16, 2012, 10:13

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.

Matthias89 · January 17, 2012, 01:57

Thanks a lot!
@cfdnewbie: Is this a 3D HIT on the CD in that book?

cfdnewbie · January 17, 2012, 08:53

yes, from a given E(k) spectrum using Rogallo's procedure (if that means anything to you....)
need more help?

cheers!

Matthias89 · January 17, 2012, 19:50

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!

cfdnewbie · January 18, 2012, 06:41

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.

Matthias89 · January 25, 2012, 22:06

Quote:

Originally Posted by cfdnewbie

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?

January 16, 2012, 10:13		#3
sail Senior Member Vieri Abolaffio Join Date: Jul 2010 Location: Always on the move. Posts: 301 Rep Power: 5	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. __________________ http://www.leadingedge.it/ Naval architecture and CFD consultancy

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January 12, 2012, 22:54	isotropic homogeneous turbulent flow field	#1
Matthias89 New Member Matthais Join Date: Jan 2012 Posts: 5 Rep Power: 3	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!

January 16, 2012, 10:06		#2
cfdnewbie Senior Member cfdnewbie Join Date: Mar 2010 Posts: 444 Rep Power: 7	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!

January 17, 2012, 01:57		#4
Matthias89 New Member Matthais Join Date: Jan 2012 Posts: 5 Rep Power: 3	Thanks a lot! @cfdnewbie: Is this a 3D HIT on the CD in that book?

January 17, 2012, 08:53		#5
cfdnewbie Senior Member cfdnewbie Join Date: Mar 2010 Posts: 444 Rep Power: 7	yes, from a given E(k) spectrum using Rogallo's procedure (if that means anything to you....) need more help? cheers!

January 17, 2012, 19:50		#6
Matthias89 New Member Matthais Join Date: Jan 2012 Posts: 5 Rep Power: 3	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!

January 18, 2012, 06:41		#7
cfdnewbie Senior Member cfdnewbie Join Date: Mar 2010 Posts: 444 Rep Power: 7	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.