Rotate frame reference in transient simulation

wjy-c · August 22, 2013, 23:27

Hi, everyone.
I'm trying to simulate a gear rotate in multiphase domain, I used the rotate frame reference for my simulation. in the picture, the green part is rotate domain, and the blue part is stationary.
123.jpg
after all the work, i find out in the simulation video that the water and air are rotating in the rotate domain, but the wall itself which represent the gear is not rotating. I tried a lot of ways to figure out, but it is still not working.
1.jpg
2.jpg
4.jpg
would anyone tell me why this problem occurred? thank you!

brunoc · August 23, 2013, 14:22

First, are you using the 'Transient Rotor Stator' model? If you're not, it won't rotate, plus your results will be incorrect.

If you are, have you checked that 'Edit > Option > CFD-Post > Angular Shift for Transient Rotating Domains' is set to 'Automatic' or 'Always rotate'?

wjy-c · August 25, 2013, 00:02

Hi, brunoc! Thank you for your advice, now my rotate frame begins to rotate in transient simulation.
but i got another question, i noticed that the distribution of water and air seems not to be reasonable at the beginning. As i showed in this picture, the water and air in the rotate domain is not continuous with the water and air in the stationary domain, which i means that the water and air moves more independently in the rotate domain, and in stationary domain, the movement of water and air does not respond as quickly as the movement in rotate domain.
5.jpg

I want to know whether this phenomenon results from the CFX software itself or results from my mistakenly settings. Thank you very much

ghorrocks · August 25, 2013, 19:31

Try using the alternate rotation model in the rotating domain settings. Also check you have a tight enough convergence criteria.

liuzexiang · September 4, 2013, 21:20

Quote:

Originally Posted by wjy-c

Hi, everyone.
I'm trying to simulate a gear rotate in multiphase domain, I used the rotate frame reference for my simulation. in the picture, the green part is rotate domain, and the blue part is stationary.
Attachment 24754
after all the work, i find out in the simulation video that the water and air are rotating in the rotate domain, but the wall itself which represent the gear is not rotating. I tried a lot of ways to figure out, but it is still not working.
Attachment 24756
Attachment 24757
Attachment 24759
would anyone tell me why this problem occurred? thank you!

hi,i want to know whether there are solid domain and fluid domain and the solid domain is set rotationg, the fluid domain is set stationary?

August 22, 2013, 23:27	Rotate frame reference in transient simulation	#1
wjy-c New Member Jingyao Wang Join Date: Jun 2013 Posts: 29 Rep Power: 12	Hi, everyone. I'm trying to simulate a gear rotate in multiphase domain, I used the rotate frame reference for my simulation. in the picture, the green part is rotate domain, and the blue part is stationary. 123.jpg after all the work, i find out in the simulation video that the water and air are rotating in the rotate domain, but the wall itself which represent the gear is not rotating. I tried a lot of ways to figure out, but it is still not working. 1.jpg 2.jpg 4.jpg would anyone tell me why this problem occurred? thank you!

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August 23, 2013, 14:22		#2
brunoc Senior Member Bruno Join Date: Mar 2009 Location: Brazil Posts: 277 Rep Power: 21	First, are you using the 'Transient Rotor Stator' model? If you're not, it won't rotate, plus your results will be incorrect. If you are, have you checked that 'Edit > Option > CFD-Post > Angular Shift for Transient Rotating Domains' is set to 'Automatic' or 'Always rotate'?

August 25, 2013, 00:02		#3
wjy-c New Member Jingyao Wang Join Date: Jun 2013 Posts: 29 Rep Power: 12	Hi, brunoc! Thank you for your advice, now my rotate frame begins to rotate in transient simulation. but i got another question, i noticed that the distribution of water and air seems not to be reasonable at the beginning. As i showed in this picture, the water and air in the rotate domain is not continuous with the water and air in the stationary domain, which i means that the water and air moves more independently in the rotate domain, and in stationary domain, the movement of water and air does not respond as quickly as the movement in rotate domain. 5.jpg I want to know whether this phenomenon results from the CFX software itself or results from my mistakenly settings. Thank you very much

August 25, 2013, 19:31		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Try using the alternate rotation model in the rotating domain settings. Also check you have a tight enough convergence criteria.