Inlet velocity expression

kingjewel1 · November 28, 2009, 13:52

Hey there,

I'm looking to implement a parabolic velocity profile at the inlet of a square duct in CEL. The expression is -2x^2+6x-4.
Could you help me out please with the dimensions ?

Best regards,

ghorrocks · November 28, 2009, 17:45

You have not stated what the dimensions are - I will assume they are metres and m/s.

Then the CEL for your function will be
velocity = -2[m/s]*(x/1[m])^2+6[m/s]*(x/1[m])-4[m/s]

kingjewel1 · November 28, 2009, 18:28

Quote:

Originally Posted by ghorrocks

You have not stated what the dimensions are - I will assume they are metres and m/s.

Then the CEL for your function will be
velocity = -2[m/s]*(x/1[m])^2+6[m/s]*(x/1[m])-4[m/s]

Thanks Glenn, the dimensional analysis was getting me stuck. I can't find any CFX documentation to help with this. Any ideas?

Best regards,

November 28, 2009, 13:52	Inlet velocity expression	#1
kingjewel1 Senior Member Join Date: Jul 2009 Posts: 260 Rep Power: 17	Hey there, I'm looking to implement a parabolic velocity profile at the inlet of a square duct in CEL. The expression is -2x^2+6x-4. Could you help me out please with the dimensions ? Best regards, Last edited by kingjewel1; November 28, 2009 at 17:09.

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November 28, 2009, 17:45		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You have not stated what the dimensions are - I will assume they are metres and m/s. Then the CEL for your function will be velocity = -2[m/s](x/1[m])^2+6[m/s](x/1[m])-4[m/s]