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Symmetry Boundary Condition for a fluid domain |
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August 31, 2009, 04:19 |
Symmetry Boundary Condition for a fluid domain
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#1 |
New Member
Zaqie
Join Date: Jul 2009
Posts: 22
Rep Power: 17 |
Hi
I am doing a fluent analysis on a water turbine blade. The bondaries I have used are as follows. 1. Velocity Inlet - at inlet 2. Mass flow outlet - at exit 3. Wall - at turbine blade 4. symmetry - at outer domain I am fine with the first three, but I am not quite sure about the fourth one i.e is the symmetry condition. As far as I know symmetry condtion is like a wall but without a shear. But in practicality wont there be some outflow. Please advice if I have some other option. Regards Zaqie |
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August 31, 2009, 05:34 |
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#2 |
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Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 3,297
Rep Power: 41 |
Switch massflow outlet to pressure outlet.
Indeed you have already defined a massflow at inlet To your symmetry... it depends on your geometry (and also your BC), but "turbine blade" sounds like periodicity. Check the help for understanding the difference
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September 4, 2009, 11:05 |
Boundary condition for turbine problem
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#3 |
New Member
Zaqie
Join Date: Jul 2009
Posts: 22
Rep Power: 17 |
Hi again
Please find attached a jpg image of 2d cross-sectional view of the turbine and its domain. I get the idea of the periodic boundary that can be used. But I am not sure of the boundary that is to be selected at the domain extends (rectangular box enclosed in the image). Any advice on that?. Regards Zaqie P.S: I tried pressure far field condition and then found out that it can only be used for ideal gas equations, rendering it not suitable for my case. |
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September 4, 2009, 17:57 |
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#4 |
New Member
Sean Delfel
Join Date: Aug 2009
Posts: 27
Rep Power: 17 |
Hello,
My vote is for a slip wall or a pressure outlet. I'd also put it as far from the foil as you can. Cheers, -sean |
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Tags |
boundary conditions, domain, fluent, symmetry, turbine |
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