initial condition for fully developed flow

kmgraju · August 5, 2010, 13:46

I am analyzing 3D flow . I would like to give the inlet velocity profile as a paraboloid as the fully developed condition. The flow in the Z direction .
According to the theory U= (1/4 μ )*(dp/dz)*(r^2-R^2). Any one give me a suggestion about the fully developed velocity profile.How I can write the above expression.

I am the leaner of CFX . Kindly help me how to write CEL Expression.

ghorrocks · August 5, 2010, 20:17

The expression is trivial, you only need to look up the documentation for the variable name for dp/dz. If you look in the CEL reference guide you will find its variable name is "dp-dZ".

kmgraju · August 5, 2010, 22:47

Hai Mr. Glenn Horrocks

I could not find the variable (dp/dz) in CFX reference document. can you help me how to write dp/dz in the CEL expression.
Thank you

ghorrocks · August 6, 2010, 06:57

Have another look in the documentation, it is there. While you are at it, have another look at my post too - I already said the variable is called "dp-dZ".

August 5, 2010, 13:46	initial condition for fully developed flow	#1
kmgraju Senior Member Govindaraju Join Date: Apr 2010 Posts: 209 Rep Power: 17	I am analyzing 3D flow . I would like to give the inlet velocity profile as a paraboloid as the fully developed condition. The flow in the Z direction . According to the theory U= (1/4 μ )(dp/dz)(r^2-R^2). Any one give me a suggestion about the fully developed velocity profile.How I can write the above expression. I am the leaner of CFX . Kindly help me how to write CEL Expression.

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August 5, 2010, 20:17		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	The expression is trivial, you only need to look up the documentation for the variable name for dp/dz. If you look in the CEL reference guide you will find its variable name is "dp-dZ".

August 5, 2010, 22:47		#3
kmgraju Senior Member Govindaraju Join Date: Apr 2010 Posts: 209 Rep Power: 17	Hai Mr. Glenn Horrocks I could not find the variable (dp/dz) in CFX reference document. can you help me how to write dp/dz in the CEL expression. Thank you

August 6, 2010, 06:57		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Have another look in the documentation, it is there. While you are at it, have another look at my post too - I already said the variable is called "dp-dZ".