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October 21, 2009, 11:24 |
Moving mesh with butterfly valve
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#1 |
New Member
Join Date: Oct 2009
Posts: 13
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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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October 21, 2009, 18:19 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144 |
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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October 21, 2009, 18:38 |
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#3 |
New Member
Join Date: Oct 2009
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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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October 21, 2009, 22:39 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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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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October 24, 2009, 10:22 |
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#5 |
New Member
Join Date: Oct 2009
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Okay I'll see what i can do. Thanks lot
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November 1, 2009, 07:30 |
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#6 |
New Member
Xue-Guan Song
Join Date: Mar 2009
Location: Busan, Korea
Posts: 14
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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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May 28, 2010, 06:54 |
butterfly valve
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#7 |
New Member
euzinho
Join Date: May 2010
Posts: 15
Rep Power: 16 |
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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May 28, 2010, 06:58 |
butterfly valve
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#8 |
New Member
euzinho
Join Date: May 2010
Posts: 15
Rep Power: 16 |
I take this oportunity to upload the model by .jpg
so, I wonder how to rotate the valve thanks |
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May 28, 2010, 08:57 |
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#9 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
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You are using Fluent. Try the Fluent forum.
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February 8, 2011, 01:20 |
butterfly valve vane movement
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#10 |
New Member
Archana
Join Date: Jul 2010
Posts: 10
Rep Power: 16 |
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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February 8, 2011, 06:15 |
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#11 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
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What is flow efd? Sounds like you are on the wrong forum too.
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February 8, 2011, 08:25 |
Butterfly Valve
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#12 |
New Member
Archana
Join Date: Jul 2010
Posts: 10
Rep Power: 16 |
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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February 8, 2011, 18:22 |
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#13 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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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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February 24, 2011, 15:03 |
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#14 |
New Member
ALEJANDRO VELASCO
Join Date: Oct 2010
Posts: 3
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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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February 24, 2011, 20:07 |
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#15 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
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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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February 25, 2011, 00:16 |
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#16 |
New Member
Archana
Join Date: Jul 2010
Posts: 10
Rep Power: 16 |
IS immeresed solid another software ? what are the steps involved in doing a cfd analysis in a butterfly valve
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February 25, 2011, 06:40 |
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#17 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
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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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