Turbulence value in boundary condition

annsal · June 1, 2023, 01:09

I modeled PM dispersion in urban areas. the average wind velocity is 0.8 m/s. I'm using the k and Epsilon models, but in boundary conditions should I choose k and epsilon in turbulence or can I use different choices like intensity and viscosity ratio?

LuckyTran · June 1, 2023, 09:11

You can use whatever combination you find convenient.

The actual boundary condition being given to the transport equation is k and epsilon and that is what Fluent needs and uses. The other methods are calculators provided to convert turbulence intensity and length scale into k and epsilon. If you know k and epsilon, use it. If you know something else, you may use those. If you know how to convert intensity and length scale into k and epsilon, you may do so. If not, Fluent does it for you.

June 1, 2023, 01:09	Turbulence value in boundary condition	#1
annsal New Member Ann Sal Join Date: Nov 2022 Posts: 2 Rep Power: 0	I modeled PM dispersion in urban areas. the average wind velocity is 0.8 m/s. I'm using the k and Epsilon models, but in boundary conditions should I choose k and epsilon in turbulence or can I use different choices like intensity and viscosity ratio?

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June 1, 2023, 09:11		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,752 Rep Power: 66	You can use whatever combination you find convenient. The actual boundary condition being given to the transport equation is k and epsilon and that is what Fluent needs and uses. The other methods are calculators provided to convert turbulence intensity and length scale into k and epsilon. If you know k and epsilon, use it. If you know something else, you may use those. If you know how to convert intensity and length scale into k and epsilon, you may do so. If not, Fluent does it for you.