Post-Processing Results for Velocity Profiles

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 October 25, 2012, 22:21 Post-Processing Results for Velocity Profiles #1 Senior Member     Ovi Join Date: Oct 2012 Location: Sydney, Australia Posts: 151 Rep Power: 6 Sponsored Links Hello Everyone, This is my first post here so I will try my best to describe the problem. I should be able to post images shortly. Domain - 3D 16 Deg. rearward facing ramp with a total domain length of 2.5 m. Assigned inlet Velocity U_0 = 4. m/s and Reynolds Number of 81 000. The outlet pressure is 0 (ambient) and the top wall is modelled as a zero-shear wall. Both sides are set to symmetry. The aim is to induce some flow separation and hence downstream Wall-normal lines have been created at 50 mm, 100 mm and 200 mm. I would like to plot Vel_U at the 3 locations on a single chart. The Y-axis needs to be the Y-coordinate (range 0-233mm) however, I am trying to present the X-axis with the 3 velocity profiles at the 3 locations respectively. I understand that the units might be very confusing for this however, I think it has been done in literature with TecPlot. Please comment on whether this is possible using ANSYS CFD Post and I will really appreciate the help.

 October 26, 2012, 06:29 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,732 Rep Power: 106 This is easy in CFD-Post. Define your points for the lines to be perpendicular to the walls and tiy can extract the velocity along the lines. I think that is what you are looking for.

October 26, 2012, 21:57
#3
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Ovi
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Location: Sydney, Australia
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Thanks for the reply Ghorrocks however, I don't think it is quite that simple. I have already drawn normal lines lying on the central, longitudinal plane of the ramp and the velocity profiles are easy to extract and export as CSV files.

I am trying to overlay these velocity profiles at the respective locations downstream such that the development of the flow is clearly and easily visualised. I have attached and image of the ramp geometry with the flow in (-x) direction [Capture.png]. The Profiles have been extracted and attached as an image [Capture2.png].

Is there a good way to create this through the user-interface or do we have to create some new expressions and variables? I have thought about making some expressions like x+u_{x} or something similar however, that is non-sense and the units would obviously be incorrect.

Thanks and appreciate the time.
Attached Images
 Capture2.jpg (31.1 KB, 51 views) Capture.jpg (12.0 KB, 35 views)

 October 27, 2012, 07:28 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,732 Rep Power: 106 In that case I do not understand what you are trying to do. Can you post an image of where you want to place the velocity profiles and what you want to do with it? Also I do not know what you mean by x+u_{x} - what is the purpose of this?

October 28, 2012, 02:46
#5
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Ovi
Join Date: Oct 2012
Location: Sydney, Australia
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I have found an example of flow through a planar asymmetric diffuser.
The attached image was taken from a study conducted by Reid A. Berdanier of Purdue University. (April, 2011)

The idea is to present the data for velocity profiles at the different downstream locations along the diffuser.

Please advise further if you think this is possible within ANSYS CFD-Post.

Regards,
Ovi
Attached Images
 TurbulentFlowThroughanAsymmetricDiffuser-image1.PNG (39.8 KB, 75 views)

 October 28, 2012, 06:57 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,732 Rep Power: 106 I understand now. I would be looking at tecplot or similar for doing something like this. This plot would be tricky in CFD-Post, but you could probably do something similar.

 October 28, 2012, 20:04 #7 Senior Member     Ovi Join Date: Oct 2012 Location: Sydney, Australia Posts: 151 Rep Power: 6 Yeah I think the result I posted previously was processed using TecPlot. I currently do not have access to this software. Can someone please provide some alternative post-processing applications which can produce similar output? I would prefer an open-source or free application that accepts CFX or Fluent Data. Thanks for any comments and suggestions.

September 18, 2016, 03:24
3-D axial velocity profiles in ANSYS CFD post
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ehsan
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Greetings Dear Friends
I want 3-D axial velocity profiles from ANSYS CFD Post down. So I can not compare my results with the photo attached.
Is there such a possibility in ANSYS CFD Post?
Attached Images
 photo_2016-09-18_11-35-43.jpg (50.7 KB, 17 views)

 September 18, 2016, 07:39 #9 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,732 Rep Power: 106 Try a user surface with an offset from an existing surface. Start with the cross section plane and offset by the velocity.

 Tags cfd - post, cfx, post-processing, tecplot, velocity graph

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