# Oscillatory flow 101

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 August 22, 2012, 08:11 Oscillatory flow 101 #1 Member   Join Date: Aug 2012 Posts: 35 Rep Power: 7 Hi all, I am using CFX to model oscillatory flow in a bifurcation. BC's are inlet with a velocity defined by a trigonometric expression that I entered, outlet with a relative pressure of 0 and wall with no-slip condition. Initial values are zero for all velocities. Transient flow has been selected, and output control to print results every second. The mesh is a simple octree mesh. This is a simple situation but it just simply does not work, I was wondering if I am missing something obvious? Any help would be greatly appreciated, Andris

August 22, 2012, 08:33
#2
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Lance
Join Date: Mar 2009
Posts: 621
Rep Power: 15
Quote:
 Originally Posted by Andris it just simply does not work, I was wondering if I am missing something obvious?
besides describing what it is that doesnt work? We cant help you if you dont give us any more info...
error messages? ccl? solver output?

 August 22, 2012, 09:24 #3 Member   Join Date: Aug 2012 Posts: 35 Rep Power: 7 Hi Lance, here is the error message An error has occurred in cfx5solve: writemms exited with non-zero return code 11 I was wondering if this transient problem has to be done in a similar way to as it is done in the tutorials, i.e. taking initial conditions from a steady state domain?

August 22, 2012, 09:38
#4
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Join Date: Aug 2012
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Rep Power: 7
Here is the geometry I am using,
I readjusted the global initialization to a very small velocity in the y direction,
I get the following error message

ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Floating point exception: Overflow |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+

+--------------------------------------------------------------------+
| ERROR #001100279 has occurred in subroutine ErrAction. |
| Message: |
| Stopped in routine FPX: C_FPX_HANDLER |
| |
| |
| |
| |
| |
+--------------------------------------------------------------------+
Attached Files
 Doc1.docx (93.9 KB, 7 views)

 August 22, 2012, 10:16 #5 Senior Member   Lance Join Date: Mar 2009 Posts: 621 Rep Power: 15

 August 22, 2012, 10:21 #6 Member   Join Date: Aug 2012 Posts: 35 Rep Power: 7 thanks for the link, instead of using an expression, I used an excel file, and got a solution, though the solution was very very bad, I am surprised it worked I was wondering if this transient problem has to be done in a similar way to as it is done in the tutorials, i.e. taking initial conditions from a steady state domain?

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