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Using reference frame motion or mesh motion?

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Old   July 26, 2013, 00:44
Default Using reference frame motion or mesh motion?
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Jie
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Dear fluent user

I am new to the Fluent to simulate a rotating propeller with the full geometry of the propeller. I have gone through the tutorial with mixing plane model and sliding mesh. In both cases, only a fraction of the propeller was modelled. I am just wondering whether it is possible to simulate the rotating propeller by rotating the entire domain. Here is the attempt I used so far:

1. load the propeller geometry into ICEMCFD and build a cylindrical flow domain (fluid zone) around the propeller
2. load the mesh into Fluent, set the "fluid zone" with "Frame motion" in the cell zone conditions with the appropriate rotational speed.
3. set the propeller and hub as stationary wall in the boundary conditions since they are rotating with the "fluid zone"
4. set the "side wall" of the domain as moving wall with absolute speed of zero (followed the mixing plane tutorial).
5. run the case with the standard k-e model.

I am just wondering whether this is the appropriate approach to perform a full rotating domain simulation?

Thanks a lot.
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Old   July 30, 2013, 15:37
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For pumps/fans/props, the need for dynamic mesh motion is required only for positive displacement i.e there is a change in volume. Else, the reference frame method is what you can use.
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Luke
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Old   July 30, 2013, 19:21
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Thanks for the reply Luke =)

Another question regarding to the pathline plot. If I want to plot the pathline not in the reference frame motion, should I turn on "Relative Pathline" or not? When I plot the pathline with "Relative Pathline" option on, all the pathlines at the upstream of the propeller rotate as well.

Cheers,

Jie
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Old   August 7, 2013, 15:49
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Dinesh Babu
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Hi JieJie,
I am currently doing the same analysis. The CFD simulation of flow through propeller (UAV). Which approach you used? Which one gave use appropriate result and had you got pathline plot?
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Old   August 7, 2013, 20:05
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Quote:
Originally Posted by devanson View Post
Hi JieJie,
I am currently doing the same analysis. The CFD simulation of flow through propeller (UAV). Which approach you used? Which one gave use appropriate result and had you got pathline plot?
Hi Devanson

I am using the reference frame approach.

Cheers
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Old   August 8, 2013, 01:29
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Paritosh Vasava
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I have been practicing the mixing problem for some time now. I have tried both dynamic mesh as well as the MFR. The dynamic mesh is turning out to be more time expensive and it requires a proper setup of the 'dynamic mesh' parameters.
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