The value of velocity

swe704 · May 25, 2009, 05:54

Hi all,

In my case,I provide the uniform (consistent)velocity with the magnitude of 1.5m/s at the inlet surface(the surface consists of several small faces,all them are with the value of 1.5m/s),but when i check the inlet surface again after simulation,i get the value of 1.55m/s(Vectors-velocity-deselect auto range-get the maximum value).Why these two values are not consistent?Does this mean some part in mesh or Fluent is wrong? I do hope i can get some explainations from you.

Thanks in advance.

Ralf Schmidt · May 25, 2009, 08:22

Hi!

I thing, that little maximum value is due to the velocity profile, that is about to begin to establish.

For checking velocity, use ->report->surface integrals.
Select the areas(s) you are interested in. Use the "area-weighted average" velocity (x,y,z or magnitude)

Ralf

May 25, 2009, 05:54	The value of velocity	#1
swe704 New Member Jin Chen Join Date: Mar 2009 Location: sweden Posts: 27 Rep Power: 17	Hi all, In my case,I provide the uniform (consistent)velocity with the magnitude of 1.5m/s at the inlet surface(the surface consists of several small faces,all them are with the value of 1.5m/s),but when i check the inlet surface again after simulation,i get the value of 1.55m/s(Vectors-velocity-deselect auto range-get the maximum value).Why these two values are not consistent?Does this mean some part in mesh or Fluent is wrong? I do hope i can get some explainations from you. Thanks in advance.

May 25, 2009, 08:22		#2
Ralf Schmidt Member Ralf Schmidt Join Date: Mar 2009 Location: Austria Posts: 67 Rep Power: 17	Hi! I thing, that little maximum value is due to the velocity profile, that is about to begin to establish. For checking velocity, use ->report->surface integrals. Select the areas(s) you are interested in. Use the "area-weighted average" velocity (x,y,z or magnitude) Ralf __________________ CFD - nothing but Colourful Fluid Dynamics Last edited by Ralf Schmidt; May 25, 2009 at 08:43.

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