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Poor mapping in "fake" 2D FSI case

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Old   March 26, 2019, 02:25
Default Poor mapping in "fake" 2D FSI case
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Bartosz Żłobiński
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Hello,

I'm doing 2-way FSI simulation in "fake" 2D (one cell in y direction). I'm modeling a musical instrument, in which a thin brass sheet vibrates in an air flow. My meshes are enclosed:
https://www.dropbox.com/s/dxtdlq0vxkstdgs/air.png?dl=0
https://www.dropbox.com/s/v91y9c61qw...brass.png?dl=0

In the full 3D case in the module "System Coupling" i'm getting 100% of nodes mapped everywhere, but in "fake" 2D in Data Transfer from air to brass these values are very poor:

https://www.dropbox.com/s/lva0n857mu...pping.png?dl=0

Changing meshes, which have quite good quality, have only very small effect.
What can be the cause?

Best regards,
Bartosz Żłobiński
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Old   March 28, 2019, 03:53
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Bartosz Żłobiński
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PS

In Debug Level 2 i'm getting for Data Transfer from air:
Code:
Mapping Controls (Conservative Aglm.):
DBG |     Tolerance  : 0.1
DBG |     Pixel Resolution   : 100
 | Data Transfer 2                  |                                 |
 |   Percent Nodes Mapped           |        15              10       |
 |   Percent Area Mapped            |        10              10       |
and for the opposite transfer:

Code:
 Mapping Controls (Profile Preserving Aglm.):
DBG |     Tolerance          : 1e-06
DBG |     Edge Tolerance     : 0.05
DBG |     Tolerance Option   : 0
DBG |     Enforce Tolerance  : 0
DBG |     Bucket Scale       : 50
 | Data Transfer                    |                                 |
 |   Percent Nodes Mapped           |       N/A             100       |
DBG |  --
DBG |   Badly Mapped Target Nodes (0):
I suppose it's the matter of Tolerances. How can I change them?
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Old   March 28, 2019, 06:31
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Bartosz Żłobiński
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Solved!

Answer is simple: cell dimention in y-direction have to be very small.
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fsi 2-way, fsi 2-way coupling, mapping fluent

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