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December 11, 2016, 20:14 |
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#21 |
New Member
Ahmad Hari
Join Date: Dec 2016
Posts: 21
Rep Power: 10 |
Hi Brian,
1- the flow direction was based on Turbo comment. Since the axis of rotation is Z, I set x = - 1, y = tan (78.33) and Z= 0. I doubly I have a problem here 2- yes the efficiency was calculated by Rital (Comcept NREC). In Rital, I designed a turbine with volute and rotor ( no stator). So, the enthalpy drop should take place at the rotor. |
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December 12, 2016, 08:20 |
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#22 |
Senior Member
Join Date: Jun 2009
Posts: 174
Rep Power: 17 |
Why did you use the compressor template in performance?
Post a 3d streamline view. |
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December 12, 2016, 09:03 |
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#23 |
New Member
Ahmad Hari
Join Date: Dec 2016
Posts: 21
Rep Power: 10 |
Hi Turbo,
I'm not using compressor template. I'm using turbine rotor template but I don't know why it appears as a compressor. Attached is the screenshot of the velocity streamlines |
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December 12, 2016, 09:49 |
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#24 |
Senior Member
Join Date: Jun 2009
Posts: 174
Rep Power: 17 |
Before trying any CFD, bear in mind that you need to study the basics of turbomachinery, especially the velocity triangle.
Your geometry setting needs a negative rpm. There will be more to fix other than that. Just study setting aside the CFD job. This forum is not aiming for providing turbomachinery education, as I know. |
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December 12, 2016, 11:08 |
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#25 |
New Member
Ahmad Hari
Join Date: Dec 2016
Posts: 21
Rep Power: 10 |
That's correct but I would be happy if you mentioned "the more things need to be fixed" though
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December 12, 2016, 18:42 |
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#26 |
Member
turbo4life
Join Date: Nov 2016
Posts: 41
Rep Power: 10 |
Based on the picture, rpm needs to be negative. Also, your inlet flow direction needs to be in the same direction as the rotation. Based on the axes you have, I think you need z=0, y=-1 and x = tan(78). I would strongly recommend reviewing this resource if you need a turbomachinery reference: https://www.google.com/url?sa=t&rct=...feI6rXhjuNutww
Turbo is correct. You need to review the basics of turbomachinery so you can troubleshoot your CFD. Chapter 8 of this resource is for radial turbines, but there is a good general review in the first few chapters as well. Best of luck! Last edited by bparrelli; December 12, 2016 at 19:57. |
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December 13, 2016, 11:17 |
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#27 |
New Member
Ahmad Hari
Join Date: Dec 2016
Posts: 21
Rep Power: 10 |
Dear Brian, Turbo and all,
Thank you for your comments and advices. I'll keep working on that till it is fixed. Brian, Using the flow direction you mentioned (z=0, y=-1 and x = tan(78).), I got the following error: ERROR #002100024 has occurred in subroutine ASS_FLX_BDINIP. | | Message: | | The specified flow direction on boundaries must not be tangential | | to the boundary. However, on the boundary patch | | | | R1 Inlet | | | | a specified flow direction having an angle of 6.2 degrees | | was found, which the solver considers as being nearly tangential. | | Please do one of the following: | | (1) Check your direction specification on this boundary. | | (2) Set the 'Flow Direction Linearisation' to 'Velocity Magnitude' | | in your boundary specification. | | (3) Modify the solver tolerance by decreasing the expert parameter | | 'tangential vector tolerance' below its default of 10 degrees. I will try to follow the comments suggested by CFX Thanks again all of you |
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May 11, 2018, 02:44 |
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#28 |
New Member
SHUJAN
Join Date: Jun 2016
Posts: 17
Rep Power: 10 |
Anas. Hi. Have you solved your issues. I need to do similar simulation and I only have 2 days to work on it. Please, can you reply.
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