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Old   April 15, 2009, 04:38
Question help about mesh deformation ?
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hi everyone
i have successfully modeled a mixing tank and its rotating blade
but can u tell me
( how can i see the rotation of the rotating wall(blade) visible in cfx-post ?)
i mean i need to see how can i have that defined rotating wall animated in cfx-post?
all i have here (in cfx-post) is an stationary blade that has no motion and i am really confused!
should i define mesh deformation or something?
please tell me what do i need?
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Old   April 15, 2009, 06:31
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Hi Hamed
You need to simulate the model as transient and then use the animation features to see the blade rotation.

BOL

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Old   April 15, 2009, 10:25
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hi tassi
u mean animation in ansys cfx pre? or in cfx-post?
how? can u explain a little more?
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Old   April 15, 2009, 10:33
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is there any need for mesh deformation ?
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Old   April 15, 2009, 18:34
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Hi,

As hamed said - if the blade rotates it will be much better to simulate it using a rotating frame of reference rather than deforming mesh. Why are you using deforming mesh?

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Old   April 16, 2009, 00:29
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Hi
No you wont have to use deforming mesh. Animation can be done in CFX-Post. Transient simulation and Animations are covered in CFX tutorials.

BOL
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Old   April 16, 2009, 04:26
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Quote:
Originally Posted by ghorrocks View Post
Hi,

As hamed said - if the blade rotates it will be much better to simulate it using a rotating frame of reference rather than deforming mesh. Why are you using deforming mesh?

Glenn Horrocks
tanks for your reply
do u mean that i need to model the blade and the tank together and then define 2 domain?all i alredy have is a tank that the blade is cuted out of that and i defined a fluid domain so defined a rotating wall boundry
that contains the blade and a stationary wall boundry that contains the tank,s wall
can u explaine how can i have a rotating frame ?(i am new to cfx)
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Old   April 16, 2009, 04:32
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here are some pic of what i have don to this tankalredy

Last edited by hmasenger; April 16, 2009 at 04:59.
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Old   April 16, 2009, 08:24
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Hi

I guess you forgot to post the pics. There is a specific tutorial in CFX for you problem. That would help you immensly.

BOL
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Old   April 16, 2009, 08:28
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Can't see the images. Can you try posting them again?
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Old   April 16, 2009, 12:49
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Quote:
Originally Posted by ghorrocks View Post
Can't see the images. Can you try posting them again?
i have forgotten to send the pics link

so that it

http://www.flickr.com/photos/37458977@N04/?saved=1

i am waiting for your friendly guidence

by the way, i will be glad to have chat with u ,if you have time of course!
thous (hmasenger)is my yahoo id
thanks again!
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Old   April 16, 2009, 12:52
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tell if any more pic is needed for underestanding the situation


http://www.flickr.com/photos/37458977@N04/?saved=1
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Old   April 16, 2009, 14:03
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Quote:
Originally Posted by Tassi View Post
Hi

I guess you forgot to post the pics. There is a specific tutorial in CFX for you problem. That would help you immensly.

BOL
can u tell me wich tuterial is similar to my problem?

tanks for your atention t
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Old   April 16, 2009, 18:19
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Can you describe how it works? I assume the impeller rotates and the big tank is stationary. In that case cut a cylinder around the impeller and put the impeller in a rotating frame of reference, the tank in a stationary frame of reference. Connect them with a GGI.

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Old   April 17, 2009, 07:21
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Quote:
Originally Posted by ghorrocks View Post
Can you describe how it works? I assume the impeller rotates and the big tank is stationary. In that case cut a cylinder around the impeller and put the impeller in a rotating frame of reference, the tank in a stationary frame of reference. Connect them with a GGI.

Glenn Horrocks
thanks a lot
i think i have got what you mean >>!
i modeled the problem again and solved that whit a rotating domain which is a cylender that the blade is cuted out of that but steal i cant see the motion in cfx-post

this is a tank which has a to plade impller that rotats whith speed of 15 rpm and i need to sudy the dissipation of water affected by the impller

here i have put the link of new pics and an animation
http://www.flickr.com/photos/37458977@N04/tags/rotating/

and i send a new thread in the forum take a look at that.
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Old   April 17, 2009, 07:33
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Hi,

That's more like it. Have a look at the tutorial examples, especially the rotating frame of reference ones - there is a turbine one and might be some others (don't have CFX in front of me so can't be sure).

Also consider whether a frozen rotor approach is adequate for you. If it is it will save heaps of time. Otherwise a full transient rotor/stator is required and that can take ages.

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