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Old   October 21, 2009, 10:24
Default Moving mesh with butterfly valve
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Hello. I have been modelling a butterfly valve on cfx 12. I try to make the valve rotate by some range of angles but i cannot make it since in the options there are only displacement and location. I used displacement under cylindrical coordinates and i managed to get deformation around the axis i wanted but half the valve was going up and half down, ie not rotating. Any ideas?
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Old   October 21, 2009, 17:19
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Do I understand you by saying the valve does not rotate (eg a throttle butterfly in a car) but has two sections which rotate in different directions to throttle the flow? An image might help explain what you mean.

Assuming you are talking about a twin-pivot butterfly, I see several options:
1) Use one rotating frame of reference for the top valve and another for the bottom.
2) Use the immersed solid feature
3) Use deforming mesh - this would be quite difficult to do and it does not appear to be the best option.
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Old   October 21, 2009, 17:38
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Hello,

No the valve is a single one. I just tried to describe it as two parts each on one side of the axis. Anyway, I looked further into it and now what i did was to create a second domain (solid) which is the valve. I made a domain interface between the fluid and the valve and now i have a different problem. I use moving mesh and at the same time try to rotate the domain of the valve. Only that rotates though, not the fluid domain...
What i have looks mich like the bottom bit from this page.
http://www.ansys.com/assets/tech-bri...oving-mesh.pdf

Thanks
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Old   October 21, 2009, 21:39
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I see, you are modelling a normal butterfly valve then.

You do not want to model the valve as a solid. That will not work (unless you use the immersed solid feature).

My recommendations are still unchanged:
1) Use a rotating frame of reference for the valve and connect it to the rest of the passage with a GGI OR
2) Use the immersed solid feature OR
3) Use a deforming mesh.

Which is the best option will depend on exactly what you are modelling.
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Old   October 24, 2009, 09:22
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Okay I'll see what i can do. Thanks lot
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Old   November 1, 2009, 07:30
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Xue-Guan Song
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Quote:
Originally Posted by uorinopuot View Post
Okay I'll see what i can do. Thanks lot
ghorrocks is right,
you can build two domain, one is flow field without valve, and the other one is a circle domain containing butterfly valve, then connect them with GGI. and then, what you should do is write a CEL to control the domain containing valve to rotate a expected angle.

some details you can refer to a journal paper:
<Dynamic analysis of three-dimensional flow in the opening process of a single-disc butterfly valve>
http://www.springerlink.com/content/vq5472u30686p9w6/
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Old   May 28, 2010, 05:54
Default butterfly valve
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Hi dear
I am trying to solve the same problem but using fluent, and I donīt have any idea how to do in order to get it done...
How can I make this valve rotate?

any help?

thanks in advance
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Old   May 28, 2010, 05:58
Default butterfly valve
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I take this oportunity to upload the model by .jpg
so, I wonder how to rotate the valve
thanks
Attached Images
File Type: jpg Dibujo.jpg (92.4 KB, 82 views)
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Old   May 28, 2010, 07:57
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You are using Fluent. Try the Fluent forum.
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Old   February 8, 2011, 01:20
Default butterfly valve vane movement
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Archana
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I am using solid works flow efd..
I have trouble in moving the vane to various location..
how do we calculate the CV torque and other values for butterfly valve any information would be of great help
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Old   February 8, 2011, 06:15
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What is flow efd? Sounds like you are on the wrong forum too.
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Old   February 8, 2011, 08:25
Default Butterfly Valve
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Archana
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its flow simulation..
its an add on in solid works.
Which is used for simulation ...
A detatiled "How to do CFD analysis in a butterfly valve ?" is what i am looking for..
It would be kind of you if you could help me...
Thanks and regards
Archana
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Old   February 8, 2011, 18:22
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In that case you definitely have the wrong forum. This forum discusses CFX. Try the general CFD forum.
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Old   February 24, 2011, 15:03
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ALEJANDRO VELASCO
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Hi, I use a solid immersed to simulate a butterfly valve, and I He obtains good results, however I have a doubt why that seems to be immersed solid permeable (part of the fluid is able to pass through it)?
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Old   February 24, 2011, 20:07
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Immersed solids work by using a momentum source. You will need to adjust the momentum source scaling factor to stop the flow going through the solid.
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Old   February 25, 2011, 00:16
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IS immeresed solid another software ? what are the steps involved in doing a cfd analysis in a butterfly valve
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Old   February 25, 2011, 06:40
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No, immersed solids is part of CFX. There is a tutorial example of how to use it.
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