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August 18, 2013, 21:59 |
Flow forces
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#1 |
New Member
Tunlu
Join Date: Aug 2013
Posts: 10
Rep Power: 12 |
Hi, Everybody !
I would like to request to share me your knowledge ! I am working on flow force acting on a suspended bar by using Fluent. The flow is perpendicularly targeted (let say Z direction) on a surface of the bar (let say X-Y plane) . I got the results ! When I extracted the flow force acting on that surface in Z direction, there was viscous force. I would like to know Why? Thank you very much. Tl |
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August 19, 2013, 03:15 |
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#2 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,396
Rep Power: 46 |
How high is the contribution of shear forces to the total force?
Are you sure that it is not just a numerical artifact caused by the fact that the normal vector of the face (especially the normal vectors of the cell faces) are never identical with the z-direction? |
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August 20, 2013, 08:01 |
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#3 |
New Member
Tunlu
Join Date: Aug 2013
Posts: 10
Rep Power: 12 |
Yes, Flotus1
The percentage of viscous force is about 0.2%. But, I like to see it as totally zero. It may be because of the fact that you said. Normal vector of faces of some element are not identical to the Z axis. Thus, viscous forces on that surface produce components in Z-axis. Right? So, we should not take account that viscous force, Right? Thank you very much, Flotus1. Tunlu |
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