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Visualize overset mesh movement

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Old   September 29, 2015, 07:48
Default Visualize overset mesh movement
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Hello, I am trying to simulate a wind turbine using overset mesh and DFBI mode. I want to visualize and record the movement of the turbine during the simulation. ¿How can I do that?
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Old   October 5, 2015, 21:26
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Create a scene of the thing you would like to see. In the scene properties go to attributes>update and check the save to file option. Configure there how often you would like it to save, and run the simulation.
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Old   October 5, 2015, 21:30
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Also, if this is a wind turbine, why do you need overset for that? You can just use RBM.
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Old   October 6, 2015, 04:14
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Because I want the wind velocity as an input.

Is there any way to calculate the inertia values for DFBI?

Thx.
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Old   October 6, 2015, 20:22
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Quote:
Originally Posted by Alberto Damas View Post
Because I want the wind velocity as an input.
Using the freestream velocity as an input and the turbine speed as an output does not require the use of an overset mesh. You can use RBM. RBM will be faster and produce less error than overset. You only need overset for large displacements with complex interactions. A wind turbine just rotates, it's simple.

To find the moment of inertia you need to know the mass distribution of the object, I don't think STAR-CCM+ can calculate it.
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Old   October 8, 2015, 05:55
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You are right, I thought RBM had the rpm as an input. Thx a lot.

I have simulated the same geometry changing some parameters: wind velocity, inicial inertia values (I don't know what this means) and DFBI object mass. None of them change the rpm obtained. Do you know what I am doing wrong?
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Old   October 8, 2015, 16:44
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Make sure the region that rotates has its motion set to 'DFBI rotation and translation' and only enable rotating in 1 direction.

If you don't know what the inertia values are, you need to take a step back and read about some basic rotational kinematics, you shouldn't be doing this problem yet.
https://en.wikipedia.org/wiki/Moment_of_inertia
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Old   March 19, 2016, 14:20
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Quote:
Originally Posted by Alberto Damas View Post
You are right, I thought RBM had the rpm as an input. Thx a lot.

I have simulated the same geometry changing some parameters: wind velocity, inicial inertia values (I don't know what this means) and DFBI object mass. None of them change the rpm obtained. Do you know what I am doing wrong?
You found the problem?
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Old   March 21, 2016, 08:31
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Yes, I don't remember what I did wrong but it works now.
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