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July 27, 2017, 05:24
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How to plot stream function in CFD post?
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#1 |
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Senior Member
Join Date: Jan 2011
Posts: 339
Rep Power: 16  |
how I want plot contour for stream function in CFD-Post? I cannot find it?
Thanks a lot |
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July 27, 2017, 07:37
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#2 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,870
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You have to define a variable which defines streamfunction, and do processing on that.
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July 27, 2017, 08:24
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#3 | |
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Senior Member
Join Date: Jan 2011
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If so I need a relation relate stream function with flow variables? I am really not know this relation?
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July 27, 2017, 08:32
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#4 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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July 27, 2017, 08:51
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#5 | |
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Senior Member
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As i understood from this post I think the relation of stream function can be written in terms of axial velocity as below:
Stream function=axial velocity (u) * vertical distance (y) Is it right? Quote:
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July 27, 2017, 08:56
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#6 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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That does not sound right to me
 Streamfunction is only defined for 2D flows. Is your flow 2D? |
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July 27, 2017, 08:59
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#7 | |
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Senior Member
Join Date: Jan 2011
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Yes 2D but I want a relation for it in terms of u-velocity?
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July 27, 2017, 09:19
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#8 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,870
Rep Power: 144 |
The velocity field is the derivative of the velocity field, so to get stream function from the velocity field you will need to integrate the velocity over the flow domain. There is no built in function to do this, you will need to write a routine to do it. I don't think you can do this in CFD-Post either, you will need something with more mathematical power (matlab, python etc).
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July 29, 2017, 03:30
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#9 |
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New Member
NISHANT
Join Date: Nov 2016
Posts: 22
Rep Power: 10 |
Well Mariam, First of all you develop the simulation of the defined problem after that if the solution is converted successfully the go to the export solution in that there is an option of stream function you can export as ASCII or CGNS forma open the ASCII in MS Excel or CGNS in CFD-Post here you have all the value of stream function at all the nodes.
Is that helpful?? If not please provide the detail of whole problem. Thank You Sent from my Tab2A7-20F using CFD Online Forum mobile app |
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July 30, 2017, 04:45
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#10 | |
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Senior Member
Join Date: Jan 2011
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Thank you NISHANT for the reply. My solution converged successfully but I cannot find steam function in export option in CFD-Post it not exist? may you send me illustrated photo if possible?
Thanks mariam Quote:
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July 30, 2017, 04:57
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#11 |
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New Member
NISHANT
Join Date: Nov 2016
Posts: 22
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Hi Mariam I am sorry but I have to do the simulation in Fluent provide a wonderful sets of parameters to be exported you can also send me the mesh flow I will do it foryou
Sent from my Tab2A7-20F using CFD Online Forum mobile app |
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July 30, 2017, 05:05
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#12 | |
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Senior Member
Join Date: Jan 2011
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You made me confused ? I am talking about CFX not FLUENT?
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July 30, 2017, 05:11
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#13 |
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New Member
NISHANT
Join Date: Nov 2016
Posts: 22
Rep Power: 10 |
Yes I know the difference but do CFD have any option to export the case and data file.
Sent from my Tab2A7-20F using CFD Online Forum mobile app |
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July 30, 2017, 05:15
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#14 |
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New Member
NISHANT
Join Date: Nov 2016
Posts: 22
Rep Power: 10 |
Give me you email I will send you an image to how to do it in fluent?
Sent from my Tab2A7-20F using CFD Online Forum mobile app |
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