Mastering Ansys: Force and Torque of propeller in Ansys Fluent (Part III)

Ansys tutorial
In this video, I walk you through setting up a CFD simulation for propeller analysis in Ansys Fluent. We'll cover how to apply periodic boundary conditions and utilize the MRF (Moving Reference Frame) approach to model the rotating propeller. I'll also explain key settings, including mesh generation, turbulence modeling, and solver configurations, to ensure accurate and efficient results.
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Please watch Part I
• Mastering Ansys: Prope...
Part II
• Mastering Ansys: Prope...
0:00 0:30 Introduction
0:31 6:00 Modeling
6:01 8:35 Results
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[@bucaliii_35_sheqilll]

thank you for your video. Why is the force is very low? I am also trying to calculate but similar results...

[@caewitharminhashemi]

You are welcome. Because mesh is coarse. Yplus must be below 5. Also propeller is small. It's quad copter propeller.

[@jehanrassdeen7928]

Is this thrust force only for one blade or two blade. Should we multiply by 2 to get net force from whole propeller

[@caewitharminhashemi]

If you are using symmetric boundary condition, you have to multiply by 2 for calculating the force in all simulation. But pressure is remains constant.

[@oy-5742]

你的计算中一直有回流的存在。你的外流域所有的边界都是压力出口。实际上我一般设置压力入口和压力出口，这样就没有回流了。如果我设置成速度入口也是会有回流的。 另外，在进行混合初始化之后，我会进行FMG初始化，这样有助于加速迭代计算，节省时间。

[@caewitharminhashemi]

Thank you for your suggestion. The domain is large enough that the reverse flow does not affect the results. Also, the reverse flow issue is addressed by using symmetry for the lateral surface of the stationary domain.

[@oy-5742]

@@caewitharminhashemi 是的，理论上10倍直径以上的流域足够大不会影响，但是如果你查看螺旋桨的流线就会发现，螺旋桨吸入了它自己的尾流，这说明，计算的流场并正常。正常的螺旋桨尾流应该是一直向下发展的，直到从压力出口结束。当然，有回流可能对计算结果没有多大影响。另外，你为什么没有把静止域设置周期面？只单独设置了旋转域？

[@caewitharminhashemi]

Thank you for your description. The mesh is very coarse because it's a tutorial video, and solving time is important. There is no problem with the fine mesh that I solve, and the answer is in accordance with your words. I always use a body of influence under the propeller with a fine mesh.@@oy-5742

[@cadinsider964]

Why it is steady? It should be transient

[@caewitharminhashemi]

Because force and Torque are steady, like lift and drag coefficients.