Visualize overset mesh movement

Alberto Damas · September 29, 2015, 06:48

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?

me3840 · October 5, 2015, 20:26

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.

me3840 · October 5, 2015, 20:30

Also, if this is a wind turbine, why do you need overset for that? You can just use RBM.

Alberto Damas · October 6, 2015, 03:14

Because I want the wind velocity as an input.

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

Thx.

me3840 · October 6, 2015, 19:22

Quote:

Originally Posted by Alberto Damas

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.

Alberto Damas · October 8, 2015, 04:55

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?

me3840 · October 8, 2015, 15:44

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

Nabuchadresar · March 19, 2016, 13:20

Quote:

Originally Posted by Alberto Damas

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?

Alberto Damas · March 21, 2016, 07:31

Yes, I don't remember what I did wrong but it works now.

September 29, 2015, 06:48	Visualize overset mesh movement	#1
Alberto Damas Member Alberto Join Date: Aug 2015 Posts: 31 Rep Power: 10	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?

October 8, 2015, 04:55		#6
Alberto Damas Member Alberto Join Date: Aug 2015 Posts: 31 Rep Power: 10	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? Nabuchadresar likes this.

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October 5, 2015, 20:26		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	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.

October 5, 2015, 20:30		#3
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	Also, if this is a wind turbine, why do you need overset for that? You can just use RBM.

October 6, 2015, 03:14		#4
Alberto Damas Member Alberto Join Date: Aug 2015 Posts: 31 Rep Power: 10	Because I want the wind velocity as an input. Is there any way to calculate the inertia values for DFBI? Thx.

October 8, 2015, 15:44		#7
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 24	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

March 21, 2016, 07:31		#9
Alberto Damas Member Alberto Join Date: Aug 2015 Posts: 31 Rep Power: 10	Yes, I don't remember what I did wrong but it works now.