I am having difficulty meshing the attached geometry for a two phase mixing type application where I care about the volume fraction at various points along the tubes.
I have defined 3 bodies
Body 1 is the outer tube wall which carries the phase 1 material
Body 2 is the inner tube wall which carries the phase 2 material
Body 3 is the central cylinder of the inner wall that represents the initial volume of phase 2 material.
I assume velocity inlets for the phase 1 as the outer doughnut ring in the larger tube and phase 2 inlet as the central cylinder of the inner tube
(I have 3 bodies because I have been attempting boolean add/subtract techniques to build the phase 1 fluid body & the phase 2 fluid body)
I am having troubles meshing this structure. Specifically selecting lines, planes, or bodies for inflation layers to assign as the Inflation geometry and geometry boundary method/boundary. I would appreciate any suggestions and I will elaborate on any (unintended) omissions or ambiguities.
The mesh thus far will complete but has issues getting into the fluent solver... I'm guessing because of the multiple bodies defined and lack of definition of their interconnection.
Thanks in Advance!
Erick
Additional Thoughts:
Based on Peter023 here: https://www.cfd-online.com/Forums/fluent/105041-fluent-periodic-boundary-condition-solved-tutorial.html I suspect that my problem is tied to the fact that what I need to mesh is something of a union (using the nomenclature of the above inline image) between the void volume of the outer cylinder corresponding to the Phase 1 Velocity Inlet Boundary Plane and the volume of the Phase 2 Velocity Inlet Boundary Plane
Based on https://www.sharcnet.ca/Software/Ans...al_bodies.html
It looks like defining a virtual body is the route I need to go given my fluid zones are voids in my existing cad models.
However - I now can't seem to enable this functionality
In the attached screen shot the Virtual Body button is disabled on the Geometry toolbar and when I right click Geometry in the Tree I do not get an option to create a virtual body. I am using ANSYS 16.2
Hi Eric,
You have really 3 bodies, but you need only one. These assembling is important if you will simulate a mechanical, or thermal problem whem the solid material of the pipe is involved. If I unterstood, this is not the case. You have a two-phase flow with an annular inlet, an internal inlet to one fluid and an annular to other phase and both will mix along the pipe till outlet.
1)First, you dont need the external and internal solid wall and You can delete them. Or only supress. As you have a simple geometry, creat a circular scketch, and from it, creat a extrusion body, in other words, a solid cilindric body with the dimater equals to the internal diameter of the pipe.
2) Creat a 2nd circular scketch on the same plane, and concentric to the first equals to the External diameter of the little pipe, and another equals to the Internal diameter.
3) Creat an extrusion body based on the annular surface formed by these two circular sckethes and REMOVE the material from the Big pipe till the width of the internal pipe.
That is finished!
This geometry is the FLUID DOMAIN, the void of the solid domain of the pipes.
After that create some named selection to have locations to setup your boundary conditions.
And finally , choose your mesh protocoll according to you models.
Bests!
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