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Advances in Volume Penalization Meth...

Thirumalaisamy, Ramakrishnan,

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Advances in Volume Penalization Methods for Simulating Multiphase Fluid-Structure Interaction and Phase-Change Phenomena /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Advances in Volume Penalization Methods for Simulating Multiphase Fluid-Structure Interaction and Phase-Change Phenomena // Ramakrishnan Thirumalaisamy.
Author:	Thirumalaisamy, Ramakrishnan,
Description:	1 electronic resource (259 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31240278
ISBN:	9798383087381

Advances in Volume Penalization Methods for Simulating Multiphase Fluid-Structure Interaction and Phase-Change Phenomena /
Thirumalaisamy, Ramakrishnan,

Advances in Volume Penalization Methods for Simulating Multiphase Fluid-Structure Interaction and Phase-Change Phenomena /Ramakrishnan Thirumalaisamy. - 1 electronic resource (259 pages)

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

The volume penalization method (VP), a type of Fictitious Domain Method, is a widely used technique for solving partial differential equations (PDEs) in complex domains. Its applications span various fields, from fluid-structure interactions like wave energy converters, bird and insect flight, fish swimming, and cardiovascular flows, to phase change applications such as glacier melting and additive manufacturing processes. This thesis presents robust and adaptive VP techniques for simulating non-isothermal phase-changing flows, as well as isothermal multiphase fluid-structure interaction problems. Using the numerically constructed flux-forcing functions for arbitrarily complex boundaries, we extend the flux-based volume penalization (VP) method to handle more general boundary conditions, including spatially varying inhomogeneous Neumann and Robin boundary conditions. Several two- and three-dimensional test examples, including flux-driven thermal convection in a concentric annular domain, are considered to assess the spatial accuracy of the numerical solutions. In addition, we propose a projection method-based preconditioning strategy for solving VP incompressible and low-Mach Navier-Stokes equations. The solver converges faster as the penalty coefficient decreases, contrary to prior experience. The developed preconditioning strategy is used in a novel low Mach enthalpy method to solve solidification and melting problems with variable thermophysical properties, including density. The proposed method captures the density change-induced flow during phase change material (PCM) melting and solidification. A gas phase is also incorporated and coupled to the solid-liquid PCM region in this formulation. The new low Mach enthalpy method is validated against analytical solutions for a PCM undergoing a large density change during its phase transition. Furthermore, we propose a set of simple sanity checks to serve as benchmarks for evaluating computational fluid dynamics (CFD) algorithms that aim to capture the volume change effects of PCMs. Adaptive mesh refinement is employed to achieve fine grid resolution in domains requiring more accuracy, such as PCM-gas and liquid-solid interfaces.

English

ISBN: 9798383087381Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Fluid-structure interaction

Advances in Volume Penalization Methods for Simulating Multiphase Fluid-Structure Interaction and Phase-Change Phenomena /
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100 1 $a Thirumalaisamy, Ramakrishnan, $e author. $3 3829925
245 1 0 $a Advances in Volume Penalization Methods for Simulating Multiphase Fluid-Structure Interaction and Phase-Change Phenomena / $c Ramakrishnan Thirumalaisamy.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (259 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
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500 $a Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
500 $a Advisors: Bhalla, Amneet Pal Singh; Saintillan, David Committee members: Saha, Abhishek; Jacobs, Gustaaf; Kim, Alicia.
502 $b Ph.D. $c University of California, San Diego $d 2024.
520 $a The volume penalization method (VP), a type of Fictitious Domain Method, is a widely used technique for solving partial differential equations (PDEs) in complex domains. Its applications span various fields, from fluid-structure interactions like wave energy converters, bird and insect flight, fish swimming, and cardiovascular flows, to phase change applications such as glacier melting and additive manufacturing processes. This thesis presents robust and adaptive VP techniques for simulating non-isothermal phase-changing flows, as well as isothermal multiphase fluid-structure interaction problems. Using the numerically constructed flux-forcing functions for arbitrarily complex boundaries, we extend the flux-based volume penalization (VP) method to handle more general boundary conditions, including spatially varying inhomogeneous Neumann and Robin boundary conditions. Several two- and three-dimensional test examples, including flux-driven thermal convection in a concentric annular domain, are considered to assess the spatial accuracy of the numerical solutions. In addition, we propose a projection method-based preconditioning strategy for solving VP incompressible and low-Mach Navier-Stokes equations. The solver converges faster as the penalty coefficient decreases, contrary to prior experience. The developed preconditioning strategy is used in a novel low Mach enthalpy method to solve solidification and melting problems with variable thermophysical properties, including density. The proposed method captures the density change-induced flow during phase change material (PCM) melting and solidification. A gas phase is also incorporated and coupled to the solid-liquid PCM region in this formulation. The new low Mach enthalpy method is validated against analytical solutions for a PCM undergoing a large density change during its phase transition. Furthermore, we propose a set of simple sanity checks to serve as benchmarks for evaluating computational fluid dynamics (CFD) algorithms that aim to capture the volume change effects of PCMs. Adaptive mesh refinement is employed to achieve fine grid resolution in domains requiring more accuracy, such as PCM-gas and liquid-solid interfaces.
546 $a English
590 $a School code: 0033
650 4 $a Mechanical engineering. $3 649730
650 4 $a Computational physics. $3 3343998
650 4 $a Fluid mechanics. $3 528155
650 4 $a Aerospace engineering. $3 1002622
653 $a Fluid-structure interaction
653 $a Linear solvers
653 $a Non-isothermal multiphase flows
653 $a Phase change material
653 $a Volume penalization method
690 $a 0548
690 $a 0216
690 $a 0204
690 $a 0538
710 2 $a University of California, San Diego. $b Mechanical and Aerospace Engineering (Joint Doctoral with SDSU). $e degree granting institution. $3 3829908
720 1 $a Bhalla, Amneet Pal Singh $e degree supervisor.
720 1 $a Saintillan, David $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 85-12B.
790 $a 0033
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31240278