Simulation of Tesla Turbine~~

- January 2, 2019 at 4:11 pm
  
  Emily Chan
  Subscriber
  
  Hey guys, I am currently working on a project which was the simulation of tesla turbine. I was planning to calculate the speed and torque of the rotor of tesla turbine with an inlet flow with 1 Pa. Does anyone know how to "set up" the boundary condition for this by using Fluid Flow (Fluent)? Hope somebody could explain the theory to me~~ Much appreciate guys...
  
  PS: I have attached my IGS file below.
- January 2, 2019 at 4:39 pm
  
  Rob
  Forum Moderator
  
  You'll probably be able to use the moving reference frame for the rotation, but the problem will be linking the drag forces to the rotation rate. The problem you have is the rotation is caused by the flow, but as the rotation is established the drag also reduces until the system reaches equilibrium between rotation and supply velocity: you will probably need a UDF to work out all of the force balances (including bearings etc).
  
  The basics are similar to the various compressor and turbine tutorials, the UDF will add a lot more complexity to the case. There are some other topics on here for wind turbines, they should give you some pointers for the UDF.
- January 2, 2019 at 4:39 pm
  
  Karthik Remella
  Administrator
  
  Hello Emily,
  
  Here are some video resources which might help you model your problem.
  
  https://www.youtube.com/watch?v=W_R_Ot5r_j0&index=5&list=PL0lZXwHtV6OmedTRo0xU5AFxCrtsSsHda
  
  https://www.youtube.com/watch?v=Plx99gVfwOA
  
  https://www.youtube.com/watch?v=OJ_WjAlKQ3M&t=444s
  
  Please see if these video help you get started. Unfortunately, as ANSYS employees, we will not be able to download your geometry file. Please let us if you have any other specific questions.
  
  Thank you.
  
  Best Regards,
  
  Karthik
- January 3, 2019 at 7:40 am
  
  Emily Chan
  Subscriber
  
  Hi Karthik, I wish to upload my wbpj file here to let you guys take a look. But I cant, why?
- January 3, 2019 at 1:50 pm
  Karthik Remella
  Administrator
  Hello Emily,
  
  You will not be able to upload your wbpj file here. You will need to archive it. Please go to 'File -> Archive' and generate the .wbpz file. You should be able to attach it.
  
  However, as ANSYS employees, we will not be able to download and look at your model files. Perhaps someone outside can provide you some inputs after looking at the files. If you're looking for support from ANSYS employees, you might have to ask pin-pointed questions and provide adequate screenshots of your model so we are able to understand the issue.
  
  Please review the following best practices before uploading your files.
  - Be efficient - As our community grows it is becoming more likely that you are not the first to ask this question. Please search before creating a new post.
  - Be clear - Provide supporting screenshots, error messages, and background information. No simulation files will be opened by ANSYS support engineers.
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  - Be patient - Please allow three days for someone to get back to you.
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  I hope this helps.
  
  Best Regards,
  Karthik
- January 3, 2019 at 2:58 pm
  
  raul.raghav
  Subscriber
  
  Emily, as Kremella mentioned, you would not be able to upload the .wbpj file. Please follow these directions to upload a workbench archive (.wbpz) file.
- January 29, 2019 at 8:32 am
  
  Dev _cfdnoob
  Subscriber
  
  Hey are you able to do this simulation I am doing the similar thing but in the fluent the residuals are getting diverged ( continuity residuals are going to 1e+05)
  
  For meshing and geometry I followed this https://www.youtube.com/watch?v=eD0nxctN_yw&t=4565s
- January 29, 2019 at 9:32 am
  
  Rob
  Forum Moderator
  
  Check the mesh quality and time step size: you're aiming for a Courant number under 1 to start with. From there also review the model dimensions (is it scaled correctly) and boundary conditions (are the numbers sensible).
  
  If you post a few pictures of your model: mesh, velocity contours (before it diverges) we may be able to offer more specific advice.
- February 1, 2019 at 1:09 pm
  
  Dev _cfdnoob
  Subscriber
  
  Hey, I have uploaded the wbpz file in the google drive link. I am still getting divergence just after 25 iterations. I checked the CFL number and time step size is about 10^-7. (Ansys version is 15.0)
  
  https://drive.google.com/file/d/1eiRuBq6FRFz28nV-ZX0H_6VR1905OWPn/view?usp=sharing
- February 1, 2019 at 5:21 pm
  
  Rob
  Forum Moderator
  
  I'd advise updating to R19.2 However, please can you post some images: staff can't download anything so only non staff can currently do anything.