how to simulate the savonius rotor by using sliding mesh method? rotor speed is 27m/s and wind speed is 7m/s? What should be the cell zone conditions? boundary conditions of rotor walls?
According to your discription, you can do lt by dynamic mesh. You can set uo two interfaces which is the sliding boundary. In fluent, you can find the setting of the speed. Good luck! If you have more question, you can send Email to me.
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Hi Mani,
There are two ways to simulate any kind of turbine in Fluent : -
1. You can use Dynamic Meshing - SDOF (Six Degree of Freedom). This method is more realistic and will calculate angular velocity of the turbine due to the pressure and viscous torque exerted by the fluid on the turbine. Finally, it will rotate the turbine using Dynamic meshing.
2. In sliding mesh method you have to provide rotational velocity of the turbine. That will make two mesh interiors to slide at their interface. For this you have to create two mesh interiors, outer and inner (inner or smaller interior will enclose the turbine). Now using mesh interface in Fluent you can create a new interface by select interfaces of the two mesh interiors. After that you can just provide rotational velocity to the inner cell zone in the cell zone conditions.
Regards,
Vidit
Hi Vidit,
I have created a savonius rotor. Using boolean operations, I have subtracted the rotor from the enclosure.
Then I meshed It and gave the named selections.
inlet,outlet,top,bottom,sides,rotor.
In boundary conditions, I have given inlet velocity as 8.464 m/s. Rotor with rotating wall condition (46.552 RPM).
Tip speed ratio is 0.77
then I run the solution.
I have got moment value of 0.14Nm.
Is it the correct procedure?
Any body please answer the question?
Hi Mani,
That is quite right, but that is neither sliding mesh nor dynamic mesh. This is a third and most simplified method knows as Single/Multi Reference Frame. In this case it will be assumed that the rotor is rotating with given angular velocity but you won't be able to capture interaction between fluid and rotating turbine in a great depth. I assume for this you are doing steady simulation?.
Although, It is a great start for this kind of project. You can always start with steady simulations and move towards transient simulations.
For calculating moments and forces this method is sufficient. If you want to study flow transition due to rotation of turbine (e.g. vortex generation) you have to use sliding or dynamic mesh cases.
Regards,
Vidit
Hi vidit,
Could you please explain how to use sliding mesh to my project. It will be better if I do project in that sliding mesh method.
Thank you
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