John Tsamopoulos

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Numerical simulations of the flow in an extrusion damper are performed using a finite volume method. The damper is assumed to consist of a shaft, with or without a spherical bulge, oscillating axially in a containing cylinder filled with a viscoplastic material of Bingham type. The response of the damper to a forced sinusoidal displacement is studied. In(More)
Finite volume methods, especially methods for complex geometries which employ curvilinear or unstructured grids, often make significant use of numerical schemes for computing the gradients of the dependent variables. Such gradient schemes may also have standalone uses, e.g. in post-processing. The most popular such schemes rely on the divergence theorem and(More)
A Volume Tracking (VT) and a Front Tracking (FT) algorithm are implemented and compared for locating the interface between two immiscible, incompressible, Newtonian fluids in a tube with a periodically varying, circular cross-section. Initially, the fluids are stationary and stratified in an axisymmetric arrangement so that one is around the axis of the(More)
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