ANSYS FLUENT; HIGH VELOCITY FLOWS through pipes

jackss · March 30, 2021, 15:08

I am trying to simulate high velocity flows ( 165 m/s) through pipes . However, at the high velocities, I am not getting good results. Can anyone give some advice ? I am using ANSYS FLUENT.
With the LES model, at the lower velocities around ( 60m/s) I am getting goodish results when I take into account the the element size and timestep size. However, at velocities higher than that, I am not getting good results. My model also includes a large about of inflation layers ( approx. 40). I am using tetrahedral elements because I wasn't getting good results with brick elements.

aero_head · March 30, 2021, 15:11

Quote:

Originally Posted by jackss

I am trying to simulate high velocity flows ( 165 m/s) through pipes . However, at the high velocities, I am not getting good results. Can anyone give some advice ? I am using ANSYS FLUENT.
With the LES model, at the lower velocities around ( 60m/s) I am getting goodish results when I take into account the the element size and timestep size. However, at velocities higher than that, I am not getting good results. My model also includes a large about of inflation layers ( approx. 40). I am using tetrahedral elements because I wasn't getting good results with brick elements.

What is the y+ of your mesh?

jackss · March 30, 2021, 17:24

less than 1 ... around 0.01 or so

March 30, 2021, 15:08	ANSYS FLUENT; HIGH VELOCITY FLOWS through pipes	#1
jackss New Member Jack SSIlver Join Date: Nov 2020 Posts: 16 Rep Power: 6	I am trying to simulate high velocity flows ( 165 m/s) through pipes . However, at the high velocities, I am not getting good results. Can anyone give some advice ? I am using ANSYS FLUENT. With the LES model, at the lower velocities around ( 60m/s) I am getting goodish results when I take into account the the element size and timestep size. However, at velocities higher than that, I am not getting good results. My model also includes a large about of inflation layers ( approx. 40). I am using tetrahedral elements because I wasn't getting good results with brick elements.

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March 30, 2021, 17:24		#3
jackss New Member Jack SSIlver Join Date: Nov 2020 Posts: 16 Rep Power: 6	less than 1 ... around 0.01 or so