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[Workbench] meshing shows error

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Old   November 25, 2017, 09:01
Default meshing shows error
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Siju simon
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While meshing my model in ansys workbench, the following error shows;
Error 1;
The source mesh cannot be correctly copied to the target surface. This might be because the surface is closed surface with degenerate​ points'.
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Old   November 26, 2017, 14:47
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Hi Simon,

What kind of setup / method are you using ? As suggested this may be due to a problematic area in your geometry or if you're using periodic BC and issues arise between source and target face. Also did you create or import the geometry ?
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Old   November 26, 2017, 21:21
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I created the model using ansys itself
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Old   November 27, 2017, 07:41
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Difficult to say without additional inputs from your side, don't forget a picture speaks a thousand words
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Old   November 27, 2017, 12:36
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Sorry...
My model was a reinforced concrete structure. I created​ the model using workbench and assigned all material properties. I thought it will automatically detect the bonding between steel and concrete. But it doesn't work. Didn't get the results and and error displayed. How can I give the interference between 2 materials​ in a single geometry. By using "manual contacts" option I tried but it doesn't work. I am very much new to Ansys software..
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Old   November 27, 2017, 13:11
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Well in your case you should put the parts (concrete // rebar) into a single multibody part so you'll have conforming mesh at the interface with no need to explicitly create a contact.

To do so in DM, select the bodies > rmb > form part. In SC you need to move them to the same component and under the property tab > share topology > group. You can refer to the help manual for additional details.

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Old   November 28, 2017, 22:19
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As you mentioned earlier, I made a reinforced concrete beam and it really worked (sharing topology). But my problem is to model a RC beam- column joint. So there comes beam, column, beam rebar, column rebar, beam stirrup and column stirrup (attaching model-fig 1). Without any grouping, ansys automatically shows the contact region between rebars and stirrups. But not showing the contact between concrete and steel. Then I made all the bodies of my geometry to a single part and shared the topology. But it gave errors at the meshing stage of modeling (attaching fig 2). So again, I made all the bodies into 2 groups; bodies of column and bodies of beam. Then I shared the topology. Here comes another problem is that the beam rebars are going into the column. So, there should be a contact region between beam rebar and column concrete. Again, it shows errors at the meshing stage(attaching fig 3). Type of meshing I provided “coarse”.

Sorry for not providing details about the model previously…
fig 1.png

fig 2.jpg

fig 3.jpg
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Old   November 29, 2017, 07:27
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Hi Simon,

Well I'm not surprised that your volume mesh failed as you have a really fast transition and dealing with different element sizes. You should definitively play with the meshing options like :
  • Relevance
  • Size functions (adaptive / proximity / curvature etc...)
  • Relevance center
  • Transition
  • Span angle center
You can also add inflation layers around your rebar and take advantage of local refinements. Moreover when you deal with contacts you can use either mesh connection groups (rmb on mesh > insert > mesh connection group) or contact match group (rmb on mesh > insert > contact match group). Depending on the contact algorithm you use the accuracy strongly depends on interaction between the components so you should definitively put effort in deriving a proper mesh.

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Old   November 29, 2017, 07:35
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What about sharing topology..? Can I make all the bodies to a single group..?
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Old   November 29, 2017, 07:41
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Yes you can definitively do that too but you still need to play around with the meshing parameters to have a good end result
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Old   November 29, 2017, 07:47
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Thanks a lot
And Hoping your advice​s in future also..
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Old   November 29, 2017, 08:24
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Ansys also has a special finite element (Solid65) to model reinforced concrete with/without rebar. This can also be a nice alternative instead of explicitly modelling your rebar. Additional details can be found her

Ansys Solid 65 - 3D Reinforced concrete solid

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Old   December 9, 2017, 21:06
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hi Gweher,
i have to cut certain portion of my model, a small portion of concrete and rebar from the bottom of beam. i have to add a new material to that portion. is it possible in ansys. what i supossed to do..?
attaching fig(cutting portion marked in red)fig 1.png
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Old   December 15, 2017, 13:16
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Hi,

Yes you can simply apply a different material to the parts in Mechanical if you have separated bodies (split them before in DM for instance).
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