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A question about direct coupling and sequential coupling

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Lirock

Lirock

Mechanical
Joined
May 27, 2006
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75
Location
CN
Hi,everyone:
I got a problem when reading ANSYS help file. In the coupled-field guide, it talks about when to Use Direct vs. Sequential. 'Direct coupling is advantageous when the coupled-field interaction is highly nonlinear'.
I wonder the meaning of 'highly nonlinear'. Does it means both of the two fields must be nonlinear or just need one of them to be?
 
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