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May 6, 2015, 11:22 |
modelling wall friction
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#1 |
New Member
Ronald Thompson
Join Date: Mar 2015
Location: Portland, Oregon, USA
Posts: 25
Rep Power: 11 |
Hi,
im currently trying to model the flow around an object in a tank using the K-epsilon solver, the object is attached to one of the concrete walls of the tank and i want to see what effect the friction of the concrete has on the acceleration of the flow around the object. my question is how do I add in the friction coefficient of the concrete into my model? |
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May 6, 2015, 14:56 |
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#2 |
Member
Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
Rep Power: 13 |
You should be able to specify a wall roughness in the boundary conditions. You cant use it with enhanced wall functions though. you can use a K-e with standard wall functions or a k-w model
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May 6, 2015, 15:17 |
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#3 |
New Member
Ronald Thompson
Join Date: Mar 2015
Location: Portland, Oregon, USA
Posts: 25
Rep Power: 11 |
do i simply put my value of friction coefficient in for the wall roughness boundary condition or is wall roughness a different scale, thanks
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May 6, 2015, 15:53 |
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#4 |
Member
Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
Rep Power: 13 |
You cant use the friction coefficient for the wall roughness value you need to specify your wall roughness value in height like millimeters. im not really sure how to take a friction coefficient and turn it into a wall roughness. You could enter various values of wall roughness until your simulation gives you the correct skin friction drag corresponding to your friction coefficient.
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April 4, 2016, 04:09 |
Wall roughness height
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#5 |
New Member
SRIVATSAN
Join Date: Apr 2016
Posts: 1
Rep Power: 0 |
I found moody chart useful in guessing the wall roughness from the friction coefficient. from the darcy weisbach factor and reynolds number, the chart gives you e/d ratio.
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Tags |
flow around a wall, flow direction, fluent 14.5, friction coefficient, wall friction |
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