Smooth transition of velocity isnt here

Martin_Sz · June 30, 2021, 06:05

Hello I have question. Im doing a simulation with rotating domain (black frame) (with fan inside).
I defined 57 rad/s on rotating domain with rotating walls of fan and rotating wall interface. On the stationary domain I only define rotation (0 rad/s value) on the interface.
Why on the borders of domains (white frame ) I dont have smoothh transition of velocity plot???

Martin_Sz · July 1, 2021, 02:48

anyone know why this happening ???

Martin_Sz · July 1, 2021, 06:28

Is that a problem in postporcessing ????
Is I need to pick Velocity in STn Frame to plot real distribution of velocity values in MRF ort Sliding MEsh models ????

Vestdam · July 1, 2021, 08:35

Yes, I believe you should present the results as velocity in stn. frame in CFD Post.

Is it a 3D model? The velocity field in the stationary domain seems a bit patchy and strange. Is it fully converged?

/vestdam

Martin_Sz · July 1, 2021, 11:40

Yes this is 3d .
Yea Ur right this model isnt full converged . Full simulation with sensivity analysis i do now.
But in both situation mrf and sliding mesh velocity will be non continous. Only velocity stn frame will be representative ???

Martin_Sz · July 2, 2021, 05:03

And I have additional question for the calculation of forces on the fan I need to make sliding mesh method with transient or only need is to make mrf with steady state ???

Vestdam · July 2, 2021, 05:47

I would always use Velocity in Stn frame in CFD post..

For force analysis, I am in the same boat as you. So far I get much better results with transient analysis compared to steady state.

/Vestdam

Martin_Sz · July 2, 2021, 06:46

thank U for the answer
Best regards

July 1, 2021, 02:48		#2
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 232 Rep Power: 12	anyone know why this happening ??? __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

July 1, 2021, 06:28		#3
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 232 Rep Power: 12	Is that a problem in postporcessing ???? Is I need to pick Velocity in STn Frame to plot real distribution of velocity values in MRF ort Sliding MEsh models ???? __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

July 1, 2021, 11:40		#5
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 232 Rep Power: 12	Yes this is 3d . Yea Ur right this model isnt full converged . Full simulation with sensivity analysis i do now. But in both situation mrf and sliding mesh velocity will be non continous. Only velocity stn frame will be representative ??? __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

July 2, 2021, 05:03		#6
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 232 Rep Power: 12	And I have additional question for the calculation of forces on the fan I need to make sliding mesh method with transient or only need is to make mrf with steady state ??? __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

July 2, 2021, 06:46		#8
Martin_Sz Senior Member Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 232 Rep Power: 12	thank U for the answer Best regards __________________ Quick Tips and Tricks, Tutorials FLuent/ CFX (CFD) https://howtooansys.blogspot.com/

July 1, 2021, 08:35		#4
Vestdam Member Vestdam Join Date: Nov 2017 Posts: 44 Rep Power: 8	Yes, I believe you should present the results as velocity in stn. frame in CFD Post. Is it a 3D model? The velocity field in the stationary domain seems a bit patchy and strange. Is it fully converged? /vestdam

July 2, 2021, 05:47		#7
Vestdam Member Vestdam Join Date: Nov 2017 Posts: 44 Rep Power: 8	I would always use Velocity in Stn frame in CFD post.. For force analysis, I am in the same boat as you. So far I get much better results with transient analysis compared to steady state. /Vestdam

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