Pressure Gradient!

January 15, 2008, 13:14

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

January 15, 2008, 16:29

Hi,

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

Glenn Horrocks

January 16, 2008, 03:30

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

January 15, 2008, 13:14	Pressure Gradient!	#1
Usman Guest Posts: n/a	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

January 15, 2008, 16:29	Re: Pressure Gradient!	#2
Glenn Horrocks Guest Posts: n/a	Hi, Isn't the pressure gradient a result of the simulation or experiment, not an input to it? Glenn Horrocks

January 16, 2008, 03:30	Re: Pressure Gradient!	#3
Johnson Guest Posts: n/a	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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