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Heat transfer in solids and Solid mechanics Coupled Transient analysis
Posted Sep 21, 2023, 5:04 a.m. EDT Heat Transfer, Structural Mechanics Version 5.5 1 Reply
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Hi, I am analysing thermal behaviour of machine assembly to get thermal deformation due to environmental temperature variation(Transient analysis). Assembly has two solid parts which are joined by bolts.In between these parts, pair that have considered is Contact pair and this pair is used in solid mechanics physics as a contact pair bounday condition. Rigid connector is used as bolt connection. Pair thermal contact is considerd in heat transfer in solid physics. when I couple these two physics, It is giving error while solving as below
Explicit-Sparse null-space function used. Nonsymmetric matrix found. Step Time Stepsize Res Jac Sol Order Tfail NLfail LinIt LinErr LinRes Explicit-Sparse null-space function used. Explicit-Sparse null-space function used. Explicit-Sparse null-space function used. Explicit-Sparse null-space function used. Warning: New constraint force nodes detected: These are not stored. This only affects the reacf() operator in postprocessing. Explicit-Sparse null-space function used.
Please guide me to fix this problem
Thank you
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What you quote is not an error, just a warning stating that reaction forces may be incorrect in postprocessing. This occurs when the set of constraints for some reason changes during the solution.
-------------------Henrik Sönnerlind
COMSOL