April 7, 2022 at 11:22 amviv_vidSubscriber
I am working on a project wherein I am studying the flow from a nozzle and analyzing the velocity distribution. The following figures show the inlet and outlet boundaries which I set initiallyApril 7, 2022 at 11:28 amaitor.amatriainSubscriberCould you please show us some pictures of the mesh? Have you tried first to solve the same case but with single flow?
April 7, 2022 at 12:38 pmRobAnsys EmployeeDid you do share topology in SpaceClaim? If yes, do you have any wall and wall:shadow pairs in the model? If no, did you do anything with the mesh interface set up in Fluent?
April 8, 2022 at 9:37 amviv_vidSubscriberDear Aitor these are the mesh pictures and yes I initialy tried with only water(without air) for the first case where the inlet was different. For the second case I have not yet tried that.
I also noticed that in fluent the inlet direction seems to be reversed somehow.
To answer you Rob yes I did share the topology. I do not have any wall shadow pair in the model and no I did not mess with the mesh interface. My archive file size is greater than 50mb therefore I am not able to attach it here. but I can provide you with the pictures if they are needed.
April 8, 2022 at 9:41 amRobAnsys EmployeeAh, did you label the face that's between the nozzle and airbox?
April 8, 2022 at 9:59 amApril 8, 2022 at 10:40 amRobAnsys EmployeeOK, there are some hard coded labels that set stuff in Fluent. Inlet, outlet, wall etc. That surface is an "interior" type, but has been forced to be an inlet. If you're lucky it's fixable in Fluent. Change the boundary type to "wall". This should give a wall & wall:shadow. Then turn the wall to interior.
April 8, 2022 at 11:06 amApril 8, 2022 at 11:08 amApril 8, 2022 at 12:25 pmRobAnsys EmployeeAre the wall and outlet adjacent to each other? This also means you don't have a flow boundary for the faces at the extreme +/- x direction. I think you'd better revert to Meshing and fix it there. It's doable in Fluent, but needs some knowledge of the mesh manipulation tools: I don't advise going that route at this point in your CFD career.
April 8, 2022 at 12:57 pmApril 8, 2022 at 2:18 pmRobAnsys EmployeeUse Named Selections. The face that's common to the two volumes should be interior. In the above the outlet is the face coloured in red.
April 11, 2022 at 11:13 amviv_vidSubscriberSo you mean I shoud put inlet at the starting point of the nozzle and outlet same as above at the extreme end of the box and in between where the two volumes share the face, put that as interior right?
April 11, 2022 at 12:18 pmRobAnsys EmployeeCorrect. There are two types of surface boundary in Fluent, internal and external. Internal have cells on both sides, and a limited set of options: that doesn't include inlets & outlets. External bc's are just that, and have inlets, outlet, symmetry etc available.
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