# Urgent star ccm help

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January 27, 2012, 19:43
Urgent star ccm help
#1
Senior Member

Ke Wu
Join Date: Jan 2012
Posts: 179
Rep Power: 7
Hi
I'm a fresher in CFD and Star ccm
I'm modelling a simple case which is 3D larminar internal flow in a pipe
Pipe length = 1000mm
Pipe diameter = 10mm
Mesh size = 0.5mm
Velocity = 0.3m/s
I attached some plots and you can have a look
However the plot for fully developed velocity profile is incorrect
Anyone can point out which step I got wrong?
How do I fix this problem?
Attached Images
 mesh 0.5mm.jpg (35.3 KB, 47 views) Fully Developed Velocity Profile.jpg (31.7 KB, 48 views) Fully Development Length.jpg (33.3 KB, 40 views) Static Pressure.jpg (33.2 KB, 36 views)

 January 29, 2012, 07:35 #2 Member   Join Date: Feb 2011 Location: DE-PB Posts: 56 Rep Power: 8 Check the position and direction of your line probe. You can also create an plane section to visualize the velocity distribution at a scalar scene at the position where your line probe is. Does the scalar displayer also shows just three areas of velocity?

 January 29, 2012, 10:16 #3 New Member   Jiashing Liu Join Date: Mar 2009 Posts: 11 Rep Power: 10 Hi, 1. Uniform flow on the face of inlet comparing with parabolic patterm flow. 2. Do you add the prism layer near the wall? There is a simulation about the fully development flow in the user guide of Star-CCM+, validations parts. BR

January 29, 2012, 11:21
#4
Senior Member

Ke Wu
Join Date: Jan 2012
Posts: 179
Rep Power: 7
Quote:
 Originally Posted by anunu Hi, 1. Uniform flow on the face of inlet comparing with parabolic patterm flow. 2. Do you add the prism layer near the wall? There is a simulation about the fully development flow in the user guide of Star-CCM+, validations parts. BR
Hi anunu
actually I used trimmer and surface remesher
I did some modification in mesh and you can have a look
I went through some info from help guide of star ccm
It is said that an interface needed to be created, is it right?
Attached Images
 200 10 mesh 1mm.jpg (53.8 KB, 34 views)

 February 2, 2012, 18:54 #5 New Member   Join Date: Jun 2009 Posts: 9 Rep Power: 10 Ke, Your mesh looks fine. Create a line probe with resolution you want. create the line probe across the diameter in the flow field with input part as your fluid region. I hope this solves your problem. P.S. I would also suggest to create prism layer to examine boundary layers. \

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