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Flow does not pass through Non-Conformal Coupling (NCC) interface between nozzle, sub

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Old   December 11, 2025, 13:16
Smile Flow does not pass through Non-Conformal Coupling (NCC) interface between nozzle, sub
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Mohammad Mesgar
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Hello everyone,
I am working with OpenFOAM v10 and using Non-Conformal Coupling (NCC) to connect two regions: a moving nozzle region and a stationary substrate region. The nozzle slides correctly over the substrate (mesh motion works and there is no element deformation), but no flow transfers across the NCC interface.

What are the common reasons why NCC transfers mesh motion but not mass/pressure?
I attached the test case.
Any advice or example setups would be very helpful.
Thank you!
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