References of "Nsiampa, Nestor"
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See detailDevelopment of a thorax CT-scan based finite element model for thoracic injury assessment
Nsiampa, Nestor; D'Otreppe, Vinciane ULg; Robbe, Cyril ULg et al

Conference (2011, November 14)

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See detailComparative study of numerical explicit schemes for impact problems
Nsiampa, Nestor; Ponthot, Jean-Philippe ULg; Noels, Ludovic ULg

in International Journal of Impact Engineering (2008), 35(12), 1688-1694

Explicit numerical schemes are used to integrate in time finite element discretization methods. Unfortunately, these numerical approaches can induce high-frequency numerical oscillations into the solution ... [more ▼]

Explicit numerical schemes are used to integrate in time finite element discretization methods. Unfortunately, these numerical approaches can induce high-frequency numerical oscillations into the solution. To eliminate or to reduce these oscillations, numerical dissipation can be introduced. The paper deals with the comparison of three different explicit schemes: the central difference scheme which is a nondissipative method, the Hulbert Chung dissipative explicit scheme and the Tchamwa-Wielgosz dissipative scheme. Particular attention is paid to the study of these algorithms’ behavior in problems involving high-velocity impacts like Taylor anvil impact and bullet-target interactions. It has been shown that Tchamwa-Wielgosz scheme is efficient in filtering the high-frequency oscillations and is more dissipative than Hulbert Chung explicit scheme. Although its convergence rate is only first order, the loss of accuracy remains limited to acceptable values. [less ▲]

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