November 19, 2020 at 7:01 ammoranlouieSubscriber
I need help understanding why my results are like this. On the left is temperature contours of freon flowing inside a copper tube, which also has temperature contours on the right. The copper tube is being heated by hot fluid. The inner tubing should be interfacing with the Freon walls, but...November 19, 2020 at 12:10 pmRobForum ModeratorThat looks like the freon domain isn't connected to the tube. Check for connectivity and the presence of interface zones if you're using Fluent. nNovember 19, 2020 at 1:05 pmmoranlouieSubscriberHello again and thanks for your help! There is a mapped-coupled interface between the two walls.nNovember 19, 2020 at 1:49 pmRobForum ModeratorThat should work. Can you post a temperature plot on a plane that's on the axis. Node values off and zoom into one (or a few) of the tubes. If you do a heat flux report over the wall between the metal & freon how much heat is transferred? nNovember 20, 2020 at 2:39 ammoranlouieSubscriberSorry this took a while,nHere is a temperature plot of the fluid domain that is supposed to be heating the tubes and cavity, where the sources is coming from the bottom:nI got a heat-flux report using the calculator of the post processor. These are the total and average values:nArea Average of Heat Flux on freonwalls: -576.223 [W m^-2], Area Average of Heat Flux on innertubes: -3.97661e+07 [W m^-2]nSum of Heat Flux on freonwalls: -2.27914e+08 [W m^-2], Sum of Heat Flux on innertubes: -1.62972e+13 [W m^-2]nI'm not sure why it's negative. I couldn't get a heat flux report from the solver because fluent deleted all my results for some reason, but at leastthe post processor preserved them. Lastly, here are images of the mesh:nCould that gap be an issue? The entire mesh has 14,019,939 nodes.nNovember 20, 2020 at 11:25 amRobForum ModeratorIs that a gap between the pipe and the core? You need the nodes to be common to both volumes or for them to be close enough that a non-conformal boundary will work (ie the surfaces are near enough the same but not connected in the geometry stage). If there's a physical gap nothing can pass over it: it means the two parts of the model are separate and no data can pass between the volumes. nSame goes for the outside: it must full surround and connect to the pipe. nViewing 5 reply threads
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