Velocity Profile at Inlet

jennap223 · September 21, 2015, 16:55

Hi all,

I am trying to use the table(x,y,z) function for my velocity of the lagrangian injector. I have followed their example on the Steve portal, but for my own simulation it doesn't seem to do it.

The inlet is a round section, as in the exit of a pipe, and I am using the 1/7th power law to get velocity based off distance from the center line where it is U_max. So, I have my profile, but when I put it into the program it does not have the velocity radially decrease from the center (radially) as the power-law and my data describe. It kind of does this odd thing where it creates the velocity along diagonal lines connecting the points (-0.000045, -0.000045) and (0.000045, 0.000045)

Any suggestions how to do this properly for a lagrangian phase velocity injector?

fluid23 · September 22, 2015, 08:54

First, your description of what it is doing is missing.

Second, try using a radial internal table not an xyz internal table. Make sure that your axis definition under region>physics values makes sense otherwise the radial direction will not be what you had anticipated.

September 21, 2015, 16:55	Velocity Profile at Inlet	#1
jennap223 New Member Jenna Join Date: Nov 2014 Posts: 18 Rep Power: 11	Hi all, I am trying to use the table(x,y,z) function for my velocity of the lagrangian injector. I have followed their example on the Steve portal, but for my own simulation it doesn't seem to do it. The inlet is a round section, as in the exit of a pipe, and I am using the 1/7th power law to get velocity based off distance from the center line where it is U_max. So, I have my profile, but when I put it into the program it does not have the velocity radially decrease from the center (radially) as the power-law and my data describe. It kind of does this odd thing where it creates the velocity along diagonal lines connecting the points (-0.000045, -0.000045) and (0.000045, 0.000045) Any suggestions how to do this properly for a lagrangian phase velocity injector? Last edited by jennap223; September 22, 2015 at 21:54.

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September 22, 2015, 08:54		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	First, your description of what it is doing is missing. Second, try using a radial internal table not an xyz internal table. Make sure that your axis definition under region>physics values makes sense otherwise the radial direction will not be what you had anticipated.