# Turbulence inlet

**URL:** <https://pyfr.discourse.group/t/turbulence-inlet/214>\
**Category:** General\
**Created:** [11 May 2018 10:43 UTC](https://pyfr.discourse.group/t/turbulence-inlet/214 "2018-05-11T10:43:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![turbvs](https://avatars.discourse-cdn.com/v4/letter/t/f14d63/32.png) [@turbvs](https://pyfr.discourse.group/u/turbvs)\
**Post date:** [11 May 2018 10:43 UTC](https://pyfr.discourse.group/t/turbulence-inlet/214/1 "2018-05-11T10:43:17Z")

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hi all,

I’m interested in running turbulent pipe like simulations for which I need to provide turbulent inlet boundary conditions.  
Assume that I can not use periodic boundary condition for inlet from the outlet.

There are two usual ways:

1. use input files for each time step from another simulation that provides developed turbulent flow.

2. provide defined fluctuations over a mean profile of the variables.

Are these options implemented in PyFR compressible or incompressible solver?

Cheers,

Vishal

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**Author:** ![p.vincent](https://yyz2.discourse-cdn.com/free1/user_avatar/pyfr.discourse.group/p.vincent/32/225_2.png) [@p.vincent](https://pyfr.discourse.group/u/p.vincent)\
**Post date:** [25 June 2018 14:35 UTC](https://pyfr.discourse.group/t/turbulence-inlet/214/2 "2018-06-25T14:35:32Z")

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Hi Vishal,

Thanks for your interest in PyFR.

Neither are implemented yet, but we are working on it, and hope to have the technology in a release soon.

Thanks

Peter

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**Author:** ![mlaufer](https://yyz2.discourse-cdn.com/free1/user_avatar/pyfr.discourse.group/mlaufer/32/609_2.png) [@mlaufer](https://pyfr.discourse.group/u/mlaufer)\
**Post date:** [13 April 2020 12:17 UTC](https://pyfr.discourse.group/t/turbulence-inlet/214/3 "2020-04-13T12:17:18Z")

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Hi Peter,  
Pinging again about this, as some time has passed.  
Any progress on turbulence level defined at the inlet? We would be happy to test and/or help implement this.  
Thanks!

Michael Laufer  
Technion CFDLAB  
Haifa, Israel

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**Author:** ![Giorgio\_Giangaspero](https://avatars.discourse-cdn.com/v4/letter/g/ce73a5/32.png) [@Giorgio\_Giangaspero](https://pyfr.discourse.group/u/Giorgio_Giangaspero)\
**Post date:** [15 April 2020 09:00 UTC](https://pyfr.discourse.group/t/turbulence-inlet/214/4 "2020-04-15T09:00:46Z")

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Hi Michael

thanks a lot for offering your help. We are actively working on this topic and we are going to come back to you with an update in 6-8 weeks.

Kind Regards  
Giorgio

Dr Giorgio Giangaspero PhD  
Research Associate  
Department of Aeronautics  
Imperial College London  
South Kensington  
London  
SW7 2AZ  
UK