# Force at wall in pipeflow

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 June 3, 2009, 06:40 Force at wall in pipeflow #1 New Member   Gunposer Join Date: Jun 2009 Posts: 8 Rep Power: 9 Hi there, How does Fluent calculate the force at a wall in 2D. Isn't there a prob with the z-cord., to calculate the Area like $F=0.5\rho v^2 A$ Greetz Gun

 June 3, 2009, 08:36 #2 New Member   mj sharawi Join Date: May 2009 Posts: 14 Rep Power: 9 Hi In 2D cases, Fluent calculates the area for a unit width in the z-direction. Whereas in 2D-axi-symmetric, it calculates for one radian rotation. Hope this answers your question. MJ

 June 8, 2009, 04:01 #3 New Member   Gunposer Join Date: Jun 2009 Posts: 8 Rep Power: 9 Thank you for your quick reply, does it mean, if I've got a wall with units of mm I multiply the "lenght x 1mm" to get the area?

June 8, 2009, 05:21
#4
New Member

Gunposer
Join Date: Jun 2009
Posts: 8
Rep Power: 9
Attached I am sending my problem.
IT is 2D laminar Fluid.
The wall in the red frame is called wallleft.
Fluent reports me the wallleft force.

Now I trie to understand, how Fluent calculate.

Density 1400kg/m³
Viscosity 2100Pas
v=0.1m/s

height = 0.1mm => A=0.1*10^-3 m * 1*10^-3 m = 10^(-7)m²

==> F=7*10^-7 N

But is my calculation right. How do I found out the Force at the wall. I dont understand the force report of Fluent, attached to the picture. Hope, somebody can give me support.

Greez Gunnar
Attached Images
 wallleft.jpg (51.6 KB, 8 views)

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