Reynolds number openfoam simulation

nous_marp · July 4, 2015, 19:11

hello, I am trying to make a simulation with an irregular domain, but I don´t know how to set the parameter "characteristic length" to determine Re number, or if the system determines the value, how it does? or uses the definition of hydraulic diameter.

I really apprecciate any response to this question?

Thanks in advance.

rapierrz · July 6, 2015, 00:02

Hi Miguel,

if you put a picture of your geometry and domain, members can help you

properly.

nous_marp · July 6, 2015, 19:28

thanks, i attached the screenshot of my simulation, my biggest question is how OpenFOAM calculate the characteristic length of a domain like this, or where is the file with that info?

rapierrz · July 8, 2015, 02:35

I think openFoam doesn't calculate the characteristic length of the domain.

Reynolds number only determine the regime of the flow and when you don't

know this is laminar or turbulent you must use DNS simulation.

for numerical simulations often determine hydrolic diameter to calculate

Reynolds number and in irregular shapes it's usually difficult.

July 4, 2015, 19:11	Reynolds number openfoam simulation	#1
nous_marp New Member Miguel Roa Pacheco Join Date: Jul 2015 Posts: 2 Rep Power: 0	hello, I am trying to make a simulation with an irregular domain, but I don´t know how to set the parameter "characteristic length" to determine Re number, or if the system determines the value, how it does? or uses the definition of hydraulic diameter. I really apprecciate any response to this question? Thanks in advance.

July 6, 2015, 00:02		#2
rapierrz Senior Member Hesam Join Date: Feb 2015 Posts: 139 Rep Power: 11	Hi Miguel, if you put a picture of your geometry and domain, members can help you properly. Last edited by rapierrz; July 6, 2015 at 03:18.

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July 8, 2015, 02:35		#4
rapierrz Senior Member Hesam Join Date: Feb 2015 Posts: 139 Rep Power: 11	I think openFoam doesn't calculate the characteristic length of the domain. Reynolds number only determine the regime of the flow and when you don't know this is laminar or turbulent you must use DNS simulation. for numerical simulations often determine hydrolic diameter to calculate Reynolds number and in irregular shapes it's usually difficult.