# calc in table viewer

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 July 25, 2007, 16:48 Re: calc in table viewer #21 Robin Guest   Posts: n/a Post your exact expression here, along with all the expressions it depends on.

 July 25, 2007, 19:01 Re: calc in table viewer #22 jan Guest   Posts: n/a =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?

 July 26, 2007, 09:09 Re: calc in table viewer #23 Robin Guest   Posts: n/a 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

 July 26, 2007, 12:37 Re: calc in table viewer #24 jan Guest   Posts: n/a 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.....................

 July 26, 2007, 12:55 Re: calc in table viewer #25 Robin Guest   Posts: n/a 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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