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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A Robust, Fully Adaptive Hybrid Level-Set/Front-Tracking Method for Two-Phase Flows with an Accurate Surface Tension Computation

Texto completo
Ceniceros, Hector D. [1] ; Roma, Alexandre M. [2] ; Silveira-Neto, Aristeu [3] ; Villar, Millena M. [3]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Calif Santa Barbara, Dept Math, Santa Barbara, CA 93106 - USA
[2] Univ Sao Paulo, Dept Matemat Aplicada, BR-05311970 Sao Paulo - Brazil
[3] Univ Fed Uberlandia, Fac Engn Mecan, BR-38400902 Uberlandia, MG - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Citações Web of Science: 16

We present a variable time step, fully adaptive in space, hybrid method for the accurate simulation of incompressible two-phase flows in the presence of surface tension in two dimensions. The method is based on the hybrid level set/front-tracking approach proposed in {[}H. D. Ceniceros and A. M. Roma, J. Comput. Phys., 205, 391400, 2005]. Geometric, interfacial quantities are computed from front-tracking via the immersed-boundary setting while the signed distance (level set) function, which is evaluated fast and to machine precision, is used as a fluid indicator. The surface tension force is obtained by employing the mixed Eulerian/Lagrangian representation introduced in {[}S. Shin, S. I. Abdel-Khalik, V. Daru and D. Juric, J. Comput. Phys., 203, 493-516, 2005] whose success for greatly reducing parasitic currents has been demonstrated. The use of our accurate fluid indicator together with effective Lagrangian marker control enhance this parasitic current reduction by several orders of magnitude. To resolve accurately and efficiently sharp gradients and salient flow features we employ dynamic, adaptive mesh refinements. This spatial adaption is used in concert with a dynamic control of the distribution of the Lagrangian nodes along the fluid interface and a variable time step, linearly implicit time integration scheme. We present numerical examples designed to test the capabilities and performance of the proposed approach as well as three applications: the long-time evolution of a fluid interface undergoing Rayleigh-Taylor instability, an example of bubble ascending dynamics, and a drop impacting on a free interface whose dynamics we compare with both existing numerical and experimental data. (AU)

Processo FAPESP: 04/13781-1 - Simulação numérica de escoamentos multifásicos complexos via refinamento adaptativo de malhas
Beneficiário:Alexandre Megiorin Roma
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 06/57099-5 - Hector Daniel Ceniceros | University of California at Santa Barbara - Estados Unidos
Beneficiário:Alexandre Megiorin Roma
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional