Moving mesh with butterfly valve
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?
|
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. |
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 |
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. |
Okay I'll see what i can do. Thanks lot
|
Quote:
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/ |
butterfly valve
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 |
butterfly valve
1 Attachment(s)
I take this oportunity to upload the model by .jpg
so, I wonder how to rotate the valve thanks |
You are using Fluent. Try the Fluent forum.
|
butterfly valve vane movement
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 |
What is flow efd? Sounds like you are on the wrong forum too.
|
Butterfly Valve
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 |
In that case you definitely have the wrong forum. This forum discusses CFX. Try the general CFD forum.
|
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)?
|
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.
|
IS immeresed solid another software ? what are the steps involved in doing a cfd analysis in a butterfly valve
|
No, immersed solids is part of CFX. There is a tutorial example of how to use it.
|
All times are GMT -4. The time now is 09:29. |