Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/147852
Title: VARIATIONAL METHODS AND APPLICATIONS FOR TURBULENT SINGLE AND TWO-PHASE FLUID-STRUCTURE INTERACTION
Authors: VAIBHAV JOSHI
ORCID iD:   orcid.org/0000-0003-1455-4808
Keywords: Two-phase, Fluid-structure interaction, Positivity, Turbulence, Variational
Issue Date: 28-May-2018
Citation: VAIBHAV JOSHI (2018-05-28). VARIATIONAL METHODS AND APPLICATIONS FOR TURBULENT SINGLE AND TWO-PHASE FLUID-STRUCTURE INTERACTION. ScholarBank@NUS Repository.
Abstract: The present thesis deals with the development of a novel three-dimensional multifield and flexible multibody computational framework based on the continuum mechanics laws to model single and two-phase fluid-structure interactions. Starting with the canonical convection-diffusion-reaction (CDR) equation, a novel positivity preserving variational (PPV) method is proposed to get stable and accurate numerical solution. The PPV method is then extended to phase-field Allen-Cahn equation and coupled with Navier-Stokes equations to model the two-phase flow. Turbulent flow is handled by a hybrid RANS/LES model through the application of the PPV method on the turbulence transport equation. The two-phase turbulent flow system is then coupled with structure in a partitioned manner via nonlinear iterative force correction scheme. This coupled framework is stable and advantageous in high fluid density ratio and low structure-to-fluid mass ratio regimes. The ultimate problem of the offshore vessel-riser system is demonstrated by the integrated and robust solver.
URI: http://scholarbank.nus.edu.sg/handle/10635/147852
Appears in Collections:Ph.D Theses (Open)

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