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Old   April 2, 2017, 21:54
Default Matching mesh
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Marcin
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Hi everyone,

I'm trying to solve FSI case (flow through compliant aorta walls). I have to create two meshes - one for solid (walls) and one for fluid (blood), but I have to do it in one mesher (im trying in default mesher from transient structural) because these meshes HAVE to match on the interface. You can see an examplary mesh that I created. It's OK, but I want to make the mesh of fluid much more dense. I can't do it with not losing matching between interfaces at the same time.

Could you give me some advices, which tool I can use, or - how to solve this problem?

Regards,
Destroy






Last edited by destroy; April 3, 2017 at 10:44.
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Old   April 3, 2017, 01:43
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Uwe Pilz
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I don't understand why you need to mesh the wall. Usual it is taken into account by boundary conditions.

Flow through arteries is laminar. You may take into account solving it 2d using an axialsymmetry. The problem here ist the rheology of the blood.
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Old   April 3, 2017, 02:50
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I have to mesh the wall - if it only account as boundary condition, the thickness of the wall will doesn't matter. My boundary condition in ANSYS Mechanical are only 2 fixed supports (2 ends of blood wall).
That's a feature of Fluid Structure Interaction - you create one mesh for Fluent and one for Mechanical.
After creating one common mesh in Mechanical, I export the inner mesh for Fluent (with suppressed wall) and after exporting I suppress fluid mesh and unsuppress solid one.
I just can't make the Fluid mesh dense enough with not losing matching between parts (fluid and solid).

PS.
- If you don't understand what I mean, look above for the examplary (unfortunately) unmached mesh, where I tried to dense fluid mesh using Body Sizing
- 2D and FSI doesnt work
- I'm using real human geometry, it's not a regular cylider, so I couldn't use axisymmetric if I could use 2D



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Old   October 21, 2017, 15:36
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Quote:
Originally Posted by destroy View Post
I have to mesh the wall - if it only account as boundary condition, the thickness of the wall will doesn't matter. My boundary condition in ANSYS Mechanical are only 2 fixed supports (2 ends of blood wall).
That's a feature of Fluid Structure Interaction - you create one mesh for Fluent and one for Mechanical.
After creating one common mesh in Mechanical, I export the inner mesh for Fluent (with suppressed wall) and after exporting I suppress fluid mesh and unsuppress solid one.
I just can't make the Fluid mesh dense enough with not losing matching between parts (fluid and solid).

PS.
- If you don't understand what I mean, look above for the examplary (unfortunately) unmached mesh, where I tried to dense fluid mesh using Body Sizing
- 2D and FSI doesnt work
- I'm using real human geometry, it's not a regular cylider, so I couldn't use axisymmetric if I could use 2D



I may seem like a captain, but you tried to make a grid in ICEAM, and then import it into the solver you need. I had this with Femap.
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Old   May 5, 2018, 10:42
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YK
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Quote:
Originally Posted by destroy View Post
I have to mesh the wall - if it only account as boundary condition, the thickness of the wall will doesn't matter. My boundary condition in ANSYS Mechanical are only 2 fixed supports (2 ends of blood wall).
That's a feature of Fluid Structure Interaction - you create one mesh for Fluent and one for Mechanical.
After creating one common mesh in Mechanical, I export the inner mesh for Fluent (with suppressed wall) and after exporting I suppress fluid mesh and unsuppress solid one.
I just can't make the Fluid mesh dense enough with not losing matching between parts (fluid and solid).

PS.
- If you don't understand what I mean, look above for the examplary (unfortunately) unmached mesh, where I tried to dense fluid mesh using Body Sizing
- 2D and FSI doesnt work
- I'm using real human geometry, it's not a regular cylider, so I couldn't use axisymmetric if I could use 2D



Hello!

Did you complete the simulation? I have been working on similar project. I need help with meshing. Please let me know if you can help.

Thanks.
YK
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