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Usman January 15, 2008 14:14

Pressure Gradient!
 
Hi guys

How can i specify constant pressure gradient in my LES simulation. In paper they have used -1.59 Pa/m as a constant pressure gradient. How can i use that value as my pressure in CFX? Thanks

Glenn Horrocks January 15, 2008 17:29

Re: Pressure Gradient!
 
Hi,

Isn't the pressure gradient a result of the simulation or experiment, not an input to it?

Glenn Horrocks

Johnson January 16, 2008 04:30

Re: Pressure Gradient!
 
Are you modelling a section of pipe or channel? If this is the case you can either:

1. Use a subdomain momentum source in the flow direction to drive the flow, which gives the desired dP/L.

2. Use a periodic domain interface with the Pressure Change option. The gradient is then (specified pressure change)/(Length of domain).

Johnson


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