technocrat |
March 23, 2010 15:20 |
Thank you for your answers.
Quote:
Originally Posted by ghorrocks
(Post 251232)
... You can create monitor points where ever you like...
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Monitor points can not be used as locations in expressions (to set up my BC in CFX-Pre I need an expression that will give values). It is possible to use Source points as locations, but I'll have to create hundreds of them (one per each hexahedra in two layers, closest to boundary) to approximate 2-nd derivative. This is possible (with perl script), but creating so much points is too slow according to my experience.
Quote:
Originally Posted by ghorrocks
(Post 251232)
...But CFX has built in gradient functions for first order derivatives...
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I didn't find a way to use this in CFX-Pre. For example this expression
Code:
probe(Velocity u.Gradient)@Source Point 1
produces error
Code:
The function 'probe' referenced in parameter 'Expression Value' in object '/FLOW:Flow Analysis 1/OUTPUT CONTROL/MONITOR OBJECTS/MONITOR POINT:Monitor
Point 1' has an invalid argument, 'Velocity u.Gradient'. The solver does not support operator-suffixed variables here.
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