Urgent star ccm help

itsme_kit · January 27, 2012, 18:43

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?
Thanks in advance

willimanili · January 29, 2012, 06:35

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?

anunu · January 29, 2012, 09:16

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

itsme_kit · January 29, 2012, 10:21

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?

sgrshukla · February 2, 2012, 17:54

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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January 29, 2012, 06:35		#2
willimanili Member Join Date: Feb 2011 Location: DE-PB Posts: 56 Rep Power: 3	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, 09:16		#3
anunu New Member Jiashing Liu Join Date: Mar 2009 Posts: 10 Rep Power: 5	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

February 2, 2012, 17:54		#5
sgrshukla New Member Sagar Shukla Join Date: Jun 2009 Location: Seattle, WA Posts: 6 Rep Power: 4	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. \