Scaling down of Geometry

Gert-Jan · April 17, 2018, 04:14

You only have to select that face and define it as wall with CRW option. When selecting that option, there are no other menus where you can set something. It is just a counter rotating wall, which compensates the rotation of your domain, to make it effectively stand still. I guess that behind the screen it will use the domain rotation speed, but then with a negative sign. Who cares. It works. Why don't you just give it try in Pre. It is very straightforward.

AS_Aero · April 17, 2018, 09:31

Hi Gert

As you can see on the image below

https://ibb.co/i64KSS

The gap between the interface surface and the front plate is 0.00001m as the thickness between turbine diameter and the interface diameter is 0.0025m. so my doubt is will this gap between the front plate and the interface is too small ? Will it cause any issue in meshing or simulation ?

Gert-Jan · April 17, 2018, 09:43

The gap is 2.5 mm. So the distance between obstacles and interface will be 1.25 mm. You need a fine mesh with inflation on both sides. There is not much you can do about it. It should not affect your simulation.

Be happy that I showed you how you can save elements be removing the other interface.....

Gert-Jan · April 18, 2018, 04:04

I reread my comment. I mentioned that you need inflation on both sides. Here I meant that you need inflation on the wall of the rotor and the housing. Not on the interface. But probably you knew that already.

AS_Aero · April 18, 2018, 08:31

Hi Gert

Thanks a lot for your recommendations. Yes I got it about the inflation. But now I have some issues or doubts on the final geometry. If you see there on the geometry I have named the surfaces and it would be great if you could have a look into it and let me know if thats correct or not.

https://wetransfer.com/downloads/ba6...8112410/4a6464

Gert-Jan · April 18, 2018, 09:04

Sorry. I stopped using Design Modeler for several years already.
I can open your geo in Spaceclaim, but then I end up with 2 solids without any name. So I can't help you this way.

AS_Aero · May 3, 2018, 09:40

Hi Gert

A small doubt regarding the counter rotating wall stuff. Here In the rotor domain I have the circular face which is supposed to be rotating as the single interface and similarly I have a face on the stator also which is circular. So for both should I give counter rotating wall or should I delete that face on the stator side ? This circular face on the stator part is fixed /attached to the same face of the casing wall.

AS_Aero · May 14, 2018, 04:07

Hi Gert

I have attached the Geometry kindly have a look, there is a small surface on the extreme end of the stator interior where the rotor interface surface ends up.

https://wetransfer.com/downloads/948...4070036/c6968f

Kindly let me know if you couldnt figure it out about what I am talking.

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April 17, 2018, 04:14		#21
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	You only have to select that face and define it as wall with CRW option. When selecting that option, there are no other menus where you can set something. It is just a counter rotating wall, which compensates the rotation of your domain, to make it effectively stand still. I guess that behind the screen it will use the domain rotation speed, but then with a negative sign. Who cares. It works. Why don't you just give it try in Pre. It is very straightforward.

April 17, 2018, 09:31		#22
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 14	Hi Gert As you can see on the image below https://ibb.co/i64KSS The gap between the interface surface and the front plate is 0.00001m as the thickness between turbine diameter and the interface diameter is 0.0025m. so my doubt is will this gap between the front plate and the interface is too small ? Will it cause any issue in meshing or simulation ?

April 17, 2018, 09:43		#23
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	The gap is 2.5 mm. So the distance between obstacles and interface will be 1.25 mm. You need a fine mesh with inflation on both sides. There is not much you can do about it. It should not affect your simulation. Be happy that I showed you how you can save elements be removing the other interface.....

April 18, 2018, 04:04		#24
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	I reread my comment. I mentioned that you need inflation on both sides. Here I meant that you need inflation on the wall of the rotor and the housing. Not on the interface. But probably you knew that already.

April 18, 2018, 08:31		#25
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 14	Hi Gert Thanks a lot for your recommendations. Yes I got it about the inflation. But now I have some issues or doubts on the final geometry. If you see there on the geometry I have named the surfaces and it would be great if you could have a look into it and let me know if thats correct or not. https://wetransfer.com/downloads/ba6...8112410/4a6464

April 18, 2018, 09:04		#26
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	Sorry. I stopped using Design Modeler for several years already. I can open your geo in Spaceclaim, but then I end up with 2 solids without any name. So I can't help you this way.

May 3, 2018, 09:40		#27
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 14	Hi Gert A small doubt regarding the counter rotating wall stuff. Here In the rotor domain I have the circular face which is supposed to be rotating as the single interface and similarly I have a face on the stator also which is circular. So for both should I give counter rotating wall or should I delete that face on the stator side ? This circular face on the stator part is fixed /attached to the same face of the casing wall.

May 14, 2018, 04:07		#28
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 14	Hi Gert I have attached the Geometry kindly have a look, there is a small surface on the extreme end of the stator interior where the rotor interface surface ends up. https://wetransfer.com/downloads/948...4070036/c6968f Kindly let me know if you couldnt figure it out about what I am talking.