Boundary layer mesh & map mesh in rectangular ribbed channel
Hello
I have a ribbed rectangular channel with two blocks on upper wall as blow: http://imageshack.us/photo/my-images...hot001rxd.jpg/ I have performed boundary layer mesh as can be seen in the image,but I don't know how to do map mesh for the face!Is it necessary do the mesh for edges first? if so,what will happen for the boundary layer meshes? How can I have a uniform mesh(with rectangular cells)? Thanks shayan |
don't do this unless you want the hybrid mesh. This geometry is easily mappable. Make few split on the straight line and create edge between vertices. Set the no of nodes on vertical edges, grading scheme and ratio of 1.1-1.2
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If i do that,I'll have more than one edge in inlet.So, I should define more than one "inlet velocity" as boundary condition and also the same condition for "pressure outlet". Is this OK?! |
you can define many edges as part of ONE boundary condition.
Your domain should be automatically set as mappable. If not, follow Far's advice. If you don't split your domain, enable "internal continuity" option in the boundary layer panel |
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I did what you said,and I got the following result: http://imageshack.us/photo/my-images...shot002td.jpg/ As you can see in the picture, after "map mesh" the mesh is disorder! I can make it fix by making the interval size smaller,but I don't really need to do that.I just want to have denser mesh near ribs and upper wall and to have the rest of face with larger mesh size! what shall I do now,Max? thank you |
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Thank you very much |
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First mesh was made in ICEM, which allows me to make the mesh in very few clicks and I just used the O-grid and every thing else is outcome. Whereas the pics below (similar to ICEM mesh) shows the mesh created by Gambit a d requires some geometric operations.
Download gambit file from this link : https://www.dropbox.com/s/05034x33i4...ed_channel.dbs http://imageshack.us/a/img405/774/83187302.png http://imageshack.us/a/img826/9830/69265640.png |
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regards |
youtube video being uploaded
Youtube clip is currently being processed and will post link, once it is done. Every thing was done in gambit, since you are using gambit
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The video is not available! |
Yeah, there was some error in uploading and done again. see this link:
https://www.youtube.com/watch?v=Gub1Kbcup2k |
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My problem was converged after 1428 iteration! May I ask you that what is the main reason? ( I think it is not acceptable) Regards Shayan |
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I use "Fluent 6.3.26" |
It was the similar case? If not then we cannot compare them!!! This may be due to mesh problem, specially the transition between different blocks (in gambit it is face). So try to make the mesh as smooth as possible and specially at the different faces boundaries there should be slow transition and same cell size on both sides of common edge. Moreover you should make the dense mesh in the regions where you expect the separation and strong gradients.
I also recommend you to make the mesh refinement study by making the successive refined meshes to conclude mesh effects on results. In short: 1. Mesh should be fine enough 2. Should be smooth as possible |
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I just could not get: 1. "Nusselt Number" plot against "Re or Position" 2. " Friction factor" plot against "Re" |
Refer to some good reference see where they plotted these values or on which plane or line? Then this can be done in Fluent or CFD-post or techplot!
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