Problem in fluent

Harpreet · August 31, 2011, 10:03

Hi,
Please help
I have modelled a jet of air coming from a nozzle, striking a wall. Initially i had a coarse mesh, which after adaption i had refined. I am facing a problem that i supplied air at a velocity of 70m/s at inlet, but after iterations the max value shown at inlet level(the place i gave inlet velocity) is showing a value of 77m/s. i had again adapted the mesh, used second order upwind for the momentum calculation but still facing similar problem of overshooting of the inlet velocity.

stuart23 · August 31, 2011, 13:46

How did you define your inlet boundary condition? What about the outlet boundary condition?

Stu

Harpreet · August 31, 2011, 23:06

Inlet boundry condition was as "Velocity Inlet" at the inlet to the nozzle, and the outlet condition was set to "Outflow"

August 31, 2011, 10:03	Problem in fluent	#1
Harpreet New Member Harpreet Join Date: May 2011 Posts: 21 Rep Power: 14	Hi, Please help I have modelled a jet of air coming from a nozzle, striking a wall. Initially i had a coarse mesh, which after adaption i had refined. I am facing a problem that i supplied air at a velocity of 70m/s at inlet, but after iterations the max value shown at inlet level(the place i gave inlet velocity) is showing a value of 77m/s. i had again adapted the mesh, used second order upwind for the momentum calculation but still facing similar problem of overshooting of the inlet velocity.

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August 31, 2011, 13:46		#2
stuart23 Senior Member Stuart Buckingham Join Date: May 2010 Location: United Kingdom Posts: 267 Rep Power: 25	How did you define your inlet boundary condition? What about the outlet boundary condition? Stu

August 31, 2011, 23:06		#3
Harpreet New Member Harpreet Join Date: May 2011 Posts: 21 Rep Power: 14	Inlet boundry condition was as "Velocity Inlet" at the inlet to the nozzle, and the outlet condition was set to "Outflow"