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Old   May 13, 2013, 13:02
Default Rotating turbine blade
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Pedro
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Hello everyone ! I work on my student project where I must modeling heat transfer between got gases in turbine duct and turbine blade. I've created domains of fluid (air) and solid (blade), and apply rotation to blade as domain motion. After first iterations I've seen that blade does not rotate. Between solid and fluid domain is applied a fluid-solid interface with General Connection as interface model and GGI mesh connection. Could you help me with this problem?
In a link below is domains model of blade and air.
http://imageshack.us/photo/my-images/14/cfx1.png/
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Old   May 13, 2013, 17:48
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Rotating solid domains is only supported in CFX V14. You cannot do it in earlier versions.

If you want to do it in V13 you will need to assume the blade is stationary.
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Old   May 14, 2013, 17:11
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I do my project in 14 version. I applied rotation to solid and fluid domain with frozen rotor option, but velocity vectors on inlet and outlet have changed, I think it is not good solution.
Any other ideas how could resolve this?
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Old   May 14, 2013, 20:16
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Can you post an image of what you think is not a good solution, and what you expect the solution to look like?
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Old   May 15, 2013, 00:16
Default Heat transfer between Turbine Solid and Fluid
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Hello,

First of all, in any turbine (you can refer to Euler Turbine Equation derivation), the heat transfer effects to the turbomachinery blades are negligible compared to the work transfer happening (Enthalpy drop fue to work transfer is higher than heat transfer).

Also, the residence time of the hot fluid inside (due to the high velocities) is very less, and hence can be neglected. Unless you want to see the effect of heat transfer on the rotor.

The method, I generally follow is:

I run steady state CFD assuming some solid heat transfer from the walls (HTC, or heat flux).

I mesh the solid domain and use this heat transfer data, interpolated on the walls of the solid domain and solve.

So, I will end up with a solution which is accurate. Yes, it will be good to have real time heat transfer modelled, but it does not work always.
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Old   May 15, 2013, 16:32
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Quote:
Originally Posted by balaji_hrrn View Post
Hello,

First of all, in any turbine (you can refer to Euler Turbine Equation derivation), the heat transfer effects to the turbomachinery blades are negligible compared to the work transfer happening (Enthalpy drop fue to work transfer is higher than heat transfer).

Also, the residence time of the hot fluid inside (due to the high velocities) is very less, and hence can be neglected. Unless you want to see the effect of heat transfer on the rotor.

The method, I generally follow is:

I run steady state CFD assuming some solid heat transfer from the walls (HTC, or heat flux).

I mesh the solid domain and use this heat transfer data, interpolated on the walls of the solid domain and solve.

So, I will end up with a solution which is accurate. Yes, it will be good to have real time heat transfer modelled, but it does not work always.
I understand but I want to apply cooling into blade. And I think it will have an influence on flow and heat transfer. So I could not choose this way. But to non cooled blade it could be good solution.
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Old   May 15, 2013, 16:44
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Quote:
Originally Posted by ghorrocks View Post
Can you post an image of what you think is not a good solution, and what you expect the solution to look like?
Applyied rotation on both domains changed inlet flow direction as on picture below. (test on simple plate to faster iteration time)
http://imageshack.us/photo/my-images/15/plateo.png/

It was oryginaly applied on normal direction, and it is visible on streamlines, in boundary conditions both inlet and outlet are set stationary not rotating. So it was not good solution.
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Old   May 15, 2013, 18:18
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I have no idea what that image is showing. You will need to explain it better.
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