LES inflow turbulence generator

canopus · February 22, 2015, 17:15

Hi
I am looking for an inflow turbulence generator code to use for LES simulations. Any pointers for FORTRAN90 code (particularly Rogallo method)?
Thanks

harishg · February 25, 2015, 04:29

There is a free turbulence generator available from the wind energy group at Denmark. It uses Mann's method to generate synthetic inflow turbulence. It is written in Fortran 90.

I have used Mann's method to generate synthetic fluctuations for atmospheric boundary layer simulation LES.

You can also look at the existing synthetic inflow generators in NREL's inflow generator TurbSim.

canopus · February 25, 2015, 05:39

Thank you very much for the pointers. I found the Mann page.

Since You have already used it can you please comment on how easy it is to integrate with
an existing parallel code? I want to do LES of a jet.

harishg · February 25, 2015, 10:20

It is pretty straightforward. You get slices of fluctuations on uniform grids. Read the paper by Mann in JFM to understand the method before using it. Should work fine for jets too. Make sure to use high- order schemes. Otherwise the fluctuations will be dissipated.

Good luck.

zxj160 · July 5, 2016, 05:20

Quote:

Originally Posted by harishg

There is a free turbulence generator available from the wind energy group at Denmark. It uses Mann's method to generate synthetic inflow turbulence. It is written in Fortran 90.

I have used Mann's method to generate synthetic fluctuations for atmospheric boundary layer simulation LES.

You can also look at the existing synthetic inflow generators in NREL's inflow generator TurbSim.

Hi harishg,

Where can I find the Fortran 90 code for Mann's method?

Many thanks,
Jian

harishg · July 8, 2016, 00:24

Quote:

Originally Posted by zxj160

Hi harishg,

Where can I find the Fortran 90 code for Mann's method?

Many thanks,
Jian

We got the code from Prof. Sorensen at DTU when we met him at a Wind Energy Workshop. I think that they had made the code available for free download. If you could not find it, you can try contacting him.

Best,
Harish

kaya · July 11, 2016, 06:39

Quote:

Originally Posted by zxj160

Hi harishg,

Where can I find the Fortran 90 code for Mann's method?

Many thanks,
Jian

although I don't have an answer to your question, I don't think you need the source code. If you want the equations, they are given in the publication. If you want to use the model, executable simply gives the required turbulence field that you can extract slices. Why bother with the source

February 22, 2015, 17:15	LES inflow turbulence generator	#1
canopus Member SM Join Date: Dec 2010 Posts: 97 Rep Power: 15	Hi I am looking for an inflow turbulence generator code to use for LES simulations. Any pointers for FORTRAN90 code (particularly Rogallo method)? Thanks

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February 25, 2015, 04:29		#2
harishg Senior Member N/A Join Date: Mar 2009 Posts: 189 Rep Power: 17	There is a free turbulence generator available from the wind energy group at Denmark. It uses Mann's method to generate synthetic inflow turbulence. It is written in Fortran 90. I have used Mann's method to generate synthetic fluctuations for atmospheric boundary layer simulation LES. You can also look at the existing synthetic inflow generators in NREL's inflow generator TurbSim.

February 25, 2015, 05:39		#3
canopus Member SM Join Date: Dec 2010 Posts: 97 Rep Power: 15	Thank you very much for the pointers. I found the Mann page. Since You have already used it can you please comment on how easy it is to integrate with an existing parallel code? I want to do LES of a jet.

February 25, 2015, 10:20		#4
harishg Senior Member N/A Join Date: Mar 2009 Posts: 189 Rep Power: 17	It is pretty straightforward. You get slices of fluctuations on uniform grids. Read the paper by Mann in JFM to understand the method before using it. Should work fine for jets too. Make sure to use high- order schemes. Otherwise the fluctuations will be dissipated. Good luck.