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Boundary Integration factor of 1000 different
Posted 2009年8月31日 GMT+2 21:591 Reply
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Hi,
If I perform a boundary integration through the PostProcessing > Boundary Integration menu on an outlet velocity, v, I get -2.428152e-9 [L/s]. Then if I then goto Options > Integration Couplings > Boundary Variables and enter VolFlow as the Name, v as the Expression and 4 as the Integration Order. Then in Global Expressions I create a variable called VolF which equals VolFlow.
I run the simulation and perform a boundary integration using the first method the result is -2.428152e-9 [L/s]. If I then look at the value of VolFlow from the PostProcessing > Global Variables VolF = -2.428152e-12
Why is there a factor of 1000 difference?
Regards,
Tom
If I perform a boundary integration through the PostProcessing > Boundary Integration menu on an outlet velocity, v, I get -2.428152e-9 [L/s]. Then if I then goto Options > Integration Couplings > Boundary Variables and enter VolFlow as the Name, v as the Expression and 4 as the Integration Order. Then in Global Expressions I create a variable called VolF which equals VolFlow.
I run the simulation and perform a boundary integration using the first method the result is -2.428152e-9 [L/s]. If I then look at the value of VolFlow from the PostProcessing > Global Variables VolF = -2.428152e-12
Why is there a factor of 1000 difference?
Regards,
Tom
1 Reply
Last Post 2009年8月31日 GMT+2 22:09
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Posted:
2 decades ago
it could be because 1000 Liters = 1 m^3. The default unit system is SI so your boundary integration result for volumetric flow rate would be in m^3/s which is 1/1000 of flow rate in L/s