Hello every one . i am modelling the soil pipe interaction in abaqus .I have done non linear analysis of pipeline crossing strike -slip fault and normal flexure load but when i off the non linearity and want to do a linear analysis abaqus give me error of speed to wave deformation for a certain node exceed 1.000. one i decreases the mesh seed size to 0.75 or below then the error resolve .Can any body explain this phenomenon?
Hi,
have you run an explicit analysis also for the linear calculations? Then, the problem was related to the so-called Courant-Friedrichs-Lewy number: the time required for a wave to travel along a distance l, where l is (without loss of generality) the average characteristic lenght of the elements of your mesh, is less than the time step use for the explicit scheme. When this happens, you encounter a loss of information between a certain time, say t0, and time t0+dt, where dt is the time step of your simulation.
The error that Abaqus gave you was related to this unphysical phenomenon.
Kind regards
https://www.sharcnet.ca/Software/Abaqus610/Documentation/docs/v6.10/books/usb/default.htm?startat=pt03ch06s03at08.html
https://en.wikipedia.org/wiki/Courant%E2%80%93Friedrichs%E2%80%93Lewy_condition
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