August 4, 2019 at 1:44 pmashokuvce1526SubscriberHello all
Can anyone please share the tutorials for fluent MHD for parallel plate flow.
August 9, 2019 at 7:14 amashokuvce1526Subscriber
I am simulating the flow between the parallel plates in ansys fluent MHD module. The fluid used here is MR Fluid. The model that i used is below, after applying magnetic field in the y-direction in MHD dialog box(B0_y component) the velocity is not decreasing.
Can someone helpme out to solve this problem.
Thanks and regards.
August 9, 2019 at 12:42 pmRobAnsys Employee
Unless there's a tutorial bundled with the documentation we can't share the materials. I'm not familiar with the MHD module, but what have you set that would slow the flow down?
August 10, 2019 at 7:26 pmjj77SubscriberThis reminds me of a emag flow meter. If this was a pipe you would get a voltage difference in the z out of plane direction, and that potential is proportional to the flow. That is it, never heard that it influences the flow otherwise emag flow meters would not work and trust me they do.
But MR seems different. This paper is OK, compare speed at centre of pipe for different B fields and you should see an effect if you model the material correctly (with emag properties)
Search for this
jafmonline.net › downloadPDF
Magnetohydrodynamic Flow of Liquid-Metal in Circular Pipes for ...
August 12, 2019 at 6:13 amashokuvce1526Subscriber
conditions are: pressure inlet= 500Pa
viscosity = 0.042Kg/ms
Permeability = 4h/m.
August 12, 2019 at 6:15 amashokuvce1526Subscriber
August 12, 2019 at 6:16 amashokuvce1526Subscriber
Gedik, E., Kurt, H., Recebli, Z., & Balan, C. (2012). Two-dimensional CFD simulation of magnetorheological fluid between two fixed parallel plates applied external magnetic field. Computers & fluids, 63, 128-134.
I trying to simulate the same paper conditions.
August 12, 2019 at 6:22 amashokuvce1526Subscriber
directly i am going to fluent MHD module. Before that i have to do any magnetostatic analysis and the results should be coupled with Ansys fluent MHD module?
August 12, 2019 at 9:12 amjj77Subscriber
I tried this type of example and I can not get it to work/give the results as needed - do not have much experience with fluent mhd .
Perhaps some of the Ansys guys can help.
August 13, 2019 at 9:52 amRobAnsys Employee
With those boundary conditions the result looks sensible: how would the magnetic field alter the flow? I also don't have those papers (don't share unless it's an open source, and recognisable, link) so no idea what it's doing.
August 13, 2019 at 12:14 pmjj77SubscriberThere is a force in the flow direction (opposes flow) that is proportional to the square of the external magnetic field (Hartmann flow the Hartmann number is the ratio between this force and viscous forces) . I can see the applied field but I do not get any force
August 13, 2019 at 12:59 pmashokuvce1526Subscriber
Applying magnetic increases the viscosity of the fluid inturn reducing the velocity of the fluid.
August 13, 2019 at 1:55 pmjj77Subscriber
As per previous post the magnetic field results in a Lorentz force opposing the fluid flow, it doesn't not change the viscosity at least in standard incompressible Hartmann flow. The ratio between the Lorentz force due to the magnetic field and the viscous forces is THE Hartmann number. Look up Hartmann flow between parallel plates and see the derivation. One needs a good understanding of both Emag and fluid mechanics to understand it. A lot of material on the subject online.
Google search the below words and look say on the 5th hit, that is a pdf called 4.pdf from ijpam which explains it all:
hartmann flow between parallel plates
August 14, 2019 at 10:43 amjj77Subscriber
I think the problem why I could not see any Force (Lorentz), induced voltage or current density is because it does not work with steady state.
If the fluent transient solver is used then it works and all the above are finally present.
Did a small benchmark (openfoam mhd tutorial - 2.3 MHD flow of a liquid), and it works fine see below (upper no B field and lower with By=20 T).
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