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Old   December 8, 2010, 11:35
Default Flow rate
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Hi, I have to find how a flow rate changes in time.
I model my nozzle driven by pressure BC and I must insert a 2D plane, and the nozzle end, to control flow rate across this. I have to find a time-behavior of flow rate.
How can I do in Flow-3D?
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Old   January 17, 2011, 02:45
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michael barkhudarov
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Quote:
Originally Posted by Sly787 View Post
Hi, I have to find how a flow rate changes in time.
I model my nozzle driven by pressure BC and I must insert a 2D plane, and the nozzle end, to control flow rate across this. I have to find a time-behavior of flow rate.
How can I do in Flow-3D?
Use a flux surface, which is a flat baffle with IBAF(1)=1. It will compute and output the total flow rate through it.
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Old   January 17, 2011, 20:49
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Nikolaidis Giorgos
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i also have a similar problem. i can view the results from this baffle. where are they?
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Old   January 17, 2011, 20:59
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Nikolaidis Giorgos
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this is my baffle. the result is always a zero. but i have flow throw this baffle.
nbafs=1, ifbaf(1)=1, bxl(1)=0., bxh(1)=0.5,
byl(1)=0., byh(1)=1., bzl(1)=0., bzh(1)=0.2, FPTITL(1) ='sxara',
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Old   January 18, 2011, 12:19
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I think you have the baffle defined incorrectly. You've 'limited' min and max x's, y's, and z's, which would create a 3-D cube, but this is not how FLOW-3D interprets a baffle. You can keep two sets of the 'limiters' (byl, byh & bzl, bzh for example), remove the x-limiters, and specify one plane 'definition' in x in which the baffle appears (and is limited): bx = 0.25, for example. As you have it defined currently, FLOW-3D is probably just ignoring it during preprocessing. Check your preprocessor messages and errors.
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Old   January 19, 2011, 01:35
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michael barkhudarov
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i also have a similar problem. i can view the results from this baffle. where are they?
Once you open the flsgrf file, the results from a flux surface baffle will be in Probe > General history data catalog, along with all other mesh-independent quantities such as fluid volume and kinetic energy, as a function of time.
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