The problem of fluid element deformation behind an advancing flow front (fountain flow) which is encountered in injection mold filling, is addressed. The fluid element trajectories were calculated by integrating the velocity field, obtained by the finite element solution of the Navier‐Stokes equations. It is shown that fluid elements from the centerline stretch as they move toward the walls and form characteristic “V”‐shapes in a rolling‐type motion before they become fully extended. The results are in good agreement with available experimental observations.

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