ANSYS Fluent Tutorial | Multiple Reference Frame (MRF) | ANSYS Workbench Tutorials | ANSYS CFD
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- Опубликовано: 18 апр 2018
- There is a rotation of small circular objects inside a large circular domain. This tutorial will help viewers to get knowledge about the steady-state solution of a moving body problem through multiple moving reference frame approache.
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![[CFD] Multiple Reference Frame (MRF) Approach for Turbomachinery](http://i.ytimg.com/vi/oa-xcE0_0UY/mqdefault.jpg)
Thanks for the video. It is quite clear to follow. I am trying to use the same approach in generating a MRF in Ansys CFX to simulate flow over a wind turbine blade, just the same model you used for the explanations. However, I am a beginner in CFX and was wondering if you have tutorial videos that covers generating a MRF frame for simulating flow of a wind turbine blade?
Hey ! When i define a zones as moving(selecting the frame motion) like in the video do i also need to define the wall as moving in the boundary conditions for the same ?
Thanks
Its not required, as the cellzone itself rotating and the wall is connected with that.
Please add a tutorial videos on mixing fluids in tank in ansys CFD simulation.
Will try to make a tutorial.
Hi! Why did you use rotating moving wall on the rectangular domain? Thanks for your answer!
there is no specific reason, you can use any shape. I have only used to show it in this tutorial that the zone is rotating, if I would have used circular section it might not be observed.
@@AnsysTutor the question was why you set the outer domain wall as rotating moving wall . not the shape of your outer domain ^^
Hi. Could you please run a steady state MRF. For a 3d system for example a mixing tank. thanks
will try to make a tutorial, its similar to the 2D case .
@@AnsysTutor Thanks for the reply. Keep up the great work. Learned a lot from your tutorials.
Hi! Why you don't set the rotation-axis origin on wall blade at boundary condition? Because in your cell zone, you change the rotation-axis origin for your 4 small circle rotating zone
In boundary conditions if you want to provide rotation it will rotate the wall only ,whereas in cellzone case the total domain will rotate including the wall, so its not required to again put ration to the walls in BCs.
Sir, I would like to do similar simulation but using dynamic mesh approach. So I would like to find the RPM of the large circle as well as the 4 of the small circle. Have you tried it, sir? I always got the small circle rotating but not with the larger one. I do appreciate it. Thank you.
Sorry I have not tried yet. I think you are doing anything wrong set up in 6dof modeling of dynamic meshing. Please check that.
Thanks. May I know how upper version Ansys file be opened in lower version.
Not possible at all.
I'm working on Ansys 19.2 and can't seem to delete the contact regions in meshing interfaces.
If I delete it directly an error appears and if I chose the edit option there is no delete in there do I just continue without doing it manually?
yes you can proceed with the automatic contact region assignment.
@@AnsysTutor alright, thanks
Will Sliding Mesh Approach work on 3D analysis?
No, it would not work. You need to enable dynamic mesh for this.
why you set the outer rectangular domain wall as rotating moving wall ?
If you wont make it a moving wall with velocity =0, then the outer domain will also rotate due to the viscous effect. Its made like that to provide a fixed wall boundary conditions to the outer wall
please help me with 2d cfd modelling of vawt using mrf method . any tutorails?books?
You can proceed the same way as shown in this tutorial.
So what is rotating causing the flow? the circular piece with the hollow rectangular shape or just the rectangular piece
observe carefully, there is rotation of both.
@@AnsysTutor so if i want to create a flow that is causing by a rotating rectangular piece, how should i approach this ?
in that case you need to do the dynamic mesh analysis.
mesh interface is not coming same for latest version in fluent
We have a recent tutorial on this, I have explained in detail about the sliding mesh approach ,conformal and non conformal meshing, how could you setup the mesh interfaces, etc. Please go through that.
I am trying to rotate one gear inside another gear in orbital motion. how I will provide orbital motion to the inner gear ??
Are you doing mechanical analysis or CFD analysis
@@AnsysTutor CFD
I think for that you need to calculate the speed each gear and put that into the solver, But in that case you need to provide rotational motion to both the gear. Both the gears would be driver.
@@AnsysTutor no, the internal gear should only rotate, the outer gear is fixed.you can check it. Working of an "Orbital motor"
How to decide axis of rotation, whether it's positive or negative
Negative speed -clockwise , positive speed-anticlockwise rotation.
Why assign the mesh interfaces manually?
fluent automatically assigns mesh interfaces, which might affect the solution or might cause some error, because of that, we generally assign mesh interfaces manually as per our requirements.
Doing this exercise on ansys 19.2 and the 'mesh interface' does't appear. Fluent doesn't seem to recognize the interfaces.
have you created the parts on different sketches?
I also faced same problem..
And yes i do created the parts on different sketches..
Please help
Mesh interface button is unclickable.
i followed every step except that i created the rectangular region in the same sketch, but the number of parts was same.
Is that the reason why??
nvm, that was the problem.
but still I'd like to know how.
As you are doing analysis with a rectangular domain ,I think you might get some error , you need to define a UDF for dynamic meshing for that rectangular region. In the current tutorial, the rotation domain is circular so there is no void in between mesh while rotation.
Could you please show the connections tab that which type of connections were established..
(and thank you for the videos)
I followed every step except, Mesh interface button is not showing in the list.
check wheather you have done all the parts in same sketch or at different sketches.
check all the boundary coditions. maybe interface boundaries automatically set as wall . change them to interface and interface list will appear
@@AnsysTutor Should be at different sketches right?
Why don't you set the reference values which is more important to validate?
Default reference values are used.
@@AnsysTutor the values
Area=diameter of the turbine
Depth=1
Length=radius of the turbine