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July 25, 2007, 16:48 |
Re: calc in table viewer
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#21 |
Guest
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Post your exact expression here, along with all the expressions it depends on.
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July 25, 2007, 19:01 |
Re: calc in table viewer
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#22 |
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=areaAve(0.5*Density *(u^2+v^2+w^2))@Default Domain Default
strange thing is that i have a speed of 15 m/s so u^2 should be 225 but i get 266.956 in joule kg^1 so am i not getting things? |
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July 26, 2007, 09:09 |
Re: calc in table viewer
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#23 |
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Hi Jan,
The expression looks fine, except as I mentioned earlier in this thread, you should not be calculating the dynamic pressure at a wall; it should be taken at your inlet. As for the return value of (u^2+v^2+w^2), the units are correct, 1 [Joule/kg] = 1 [m^2/s^2]. If you look at v and w in the same region you'll find that they have a small value on the order of 6 m/s. The expression is fine as is and works for me here. I suggest you contact customer support if you are still having issues. Regards, Robin |
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July 26, 2007, 12:37 |
Re: calc in table viewer
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#24 |
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hi robin
thanks for the answer but i am still puzzeled for the speed since its totaly off so where sould i take the speed wich i am starting with that is 15 m/s normaly you would say velocity u but it give me more then 16 m/s every where i try to get the good speed wich is as i said 15 m/s i get more the 16m/s on wall or outlet or inlet keep geeting the wrong speed i double checked i start with 15 m/s so..................... |
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July 26, 2007, 12:55 |
Re: calc in table viewer
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#25 |
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If you have a constant velocity of 15 m/s at the inlet the development of boundary layers will force the flow to accelerate away from the wall, hence the higher velocity. If you want to use 15 m/s to calculate the dynamic pressure, just enter it explicitly.
-Robin |
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