December 17, 2019 at 11:52 amssshivamSubscriber
I am doing Jet impingement heat transfer phenomenon on a solid plate in 2D. Solid plate is at 500K initially. Now from air jet impingement, it will cool down the Solid target plate.
I am initializing solid plate using patch option. I am running steady sate phenomenon. The problem here is I am not able to observe temperature variations in solid domain. However there is temperature variation along interface in fluid region only.
I need to see temperature variation in solid plate to do structural analysis. Interface is automatically selected as "Coupled" for both wall and its shadow. Please help.
December 17, 2019 at 3:28 pmRobAnsys Employee
Have you created a multibody part (DesignModeler) or used Share Topology (SpaceClaim)? It sounds like the two volumes aren't passing information.
December 17, 2019 at 3:37 pm
December 18, 2019 at 1:47 pmRobAnsys Employee
Now check boundary conditions. In steady state what is stopping the whole domain dropping/increasing to the air temperature?
December 19, 2019 at 4:55 amssshivamSubscriber
Sir, in steady state, the temperature of entire domain (both fluid and solid) is reduced to fluid temperature. Is it what supposed to happen as I believe at infinity, the temperature of solid will reach to fluid temperature?
December 19, 2019 at 11:41 amRobAnsys Employee
Yes, steady state is the equilibrium condition. If you want to look at the cool down you need a transient solution.
December 20, 2019 at 4:18 amssshivamSubscriber
Ty sir, I have solved the problem for this convection using transient solution. Now I need to apply CHF boiling model for because of film boiling on solid surface. Please suggest me the further approach as everytime I run my solution, errors do appear.
Its a 3 phase flow. In fluid domain air is there, Water will come from inlet, further as water fall on solid, film boiling occurs and vapors are form (3 phases : air, water and vapor). Now I am making assumption that air is same as vapor and reducing the problem to 2 phase flow. Now, Vapor is there is entire fluid domain and water enters from inlet. As water falls on heated solid, film boiling occurs and vapors are formed.
I am using by default boiling conditions (saturation temp = 373K) and setting my residual monitor when water facet maximum temperature reaches 373K (as boiling will stop at this condition). Please help.
December 20, 2019 at 10:43 amRobAnsys Employee
You can create a phase which comprises a species mixture: ie air & vapour. What errors are you seeing?
December 24, 2019 at 5:29 amssshivamSubscriber
Sir, my solid domain(which is a thin plate) is moving with velocity=10m/s in above mentioned Jet impingement problem. I am initializing my solid domain with 800 kelvin using patch option. Vapors were visible initially(before 1 sec), but after that there are no vapors (may be because temp is reduced)
I want my incoming moving domain to be at 800K, but I think fluent is updating cooled temperature for incoming solid domain because of which vapors aren't visible.
December 24, 2019 at 12:54 pmRobAnsys Employee
What did you set the solid temperature at on the boundary? You may need to revise the extent of the domain if you're moving the solid zone.
December 25, 2019 at 9:56 amssshivamSubscriber
Sir, I have solved that problem, I was using symmetric condition which was causing problem as the flow wont be symmetric anymore for moving domain. As a further progress, I have implemented the boiling model successfully too.
Now, I am stuck with a new problem, which is: I have used coupled condition on the vertical solid walls. I want to use the simulated temperature values at outlet wall as the inlet temperature wall values as a next part of this problem. Geometry is same. Please suggest how to proceed.
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