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Towards Large-Scale Simulations of T...

Wang, Sheng.

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Towards Large-Scale Simulations of Two-Phase Flows with Moving Contact Lines in Complex Geometries.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Towards Large-Scale Simulations of Two-Phase Flows with Moving Contact Lines in Complex Geometries./
作者:	Wang, Sheng.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	159 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-07, Section: B.
Contained By:	Dissertations Abstracts International80-07B.
標題:	Fluid mechanics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13419163
ISBN:	9780438783478

Towards Large-Scale Simulations of Two-Phase Flows with Moving Contact Lines in Complex Geometries.
Wang, Sheng.

Towards Large-Scale Simulations of Two-Phase Flows with Moving Contact Lines in Complex Geometries. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 159 p.

Source: Dissertations Abstracts International, Volume: 80-07, Section: B.

Thesis (Ph.D.)--Cornell University, 2018.

This item must not be sold to any third party vendors.

Predictive simulation of two-phase flows with moving contact lines is challenging due to their inherent multi-physics and multi-scale nature. Directly simulating such flows incurs an enormous computational cost due to the widely disparate scales at the contact line. Moreover, simulations of viscosity-dominated two-phase flows with moving contact lines are often reported to be mesh-dependent due to the diverging viscous stress at the contact point. This dissertation addresses the above simulation issues and by building a numerical framework to enable large-scale 3D simulations of two-phase flows in complex geometries. By analyzing the weak form of the Navier-Stokes equations for a control volume adjacent to a wall with moving contact line, two unclosed terms are identified: a sub-grid scale (SGS) surface tension force and an SGS viscous force. A closure for the SGS surface tension force is first proposed and tested in a numerical framework for simulating two-phase flows with contact lines. This framework combines a conservative level set method to capture the interface and a conservative cut-cell immersed boundary method to handle complex geometries. Detailed verification tests confirm that simulations using this framework are discretely conservative, accurate, and robust. Secondly, a physics-based closure is derived for the SGS viscous force. Simulations these two SGS models are verified to be mesh-independent and physically accurate across a number of viscosity-dominated two-phase flows, including drop spreading on a horizontal plane and drop sliding down an inclined plane. Finally, the present approach is applied in the study of drop-fiber interactions and jet-wall interactions.

ISBN: 9780438783478Subjects--Topical Terms:

528155
Fluid mechanics.

Towards Large-Scale Simulations of Two-Phase Flows with Moving Contact Lines in Complex Geometries.
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520 $a Predictive simulation of two-phase flows with moving contact lines is challenging due to their inherent multi-physics and multi-scale nature. Directly simulating such flows incurs an enormous computational cost due to the widely disparate scales at the contact line. Moreover, simulations of viscosity-dominated two-phase flows with moving contact lines are often reported to be mesh-dependent due to the diverging viscous stress at the contact point. This dissertation addresses the above simulation issues and by building a numerical framework to enable large-scale 3D simulations of two-phase flows in complex geometries. By analyzing the weak form of the Navier-Stokes equations for a control volume adjacent to a wall with moving contact line, two unclosed terms are identified: a sub-grid scale (SGS) surface tension force and an SGS viscous force. A closure for the SGS surface tension force is first proposed and tested in a numerical framework for simulating two-phase flows with contact lines. This framework combines a conservative level set method to capture the interface and a conservative cut-cell immersed boundary method to handle complex geometries. Detailed verification tests confirm that simulations using this framework are discretely conservative, accurate, and robust. Secondly, a physics-based closure is derived for the SGS viscous force. Simulations these two SGS models are verified to be mesh-independent and physically accurate across a number of viscosity-dominated two-phase flows, including drop spreading on a horizontal plane and drop sliding down an inclined plane. Finally, the present approach is applied in the study of drop-fiber interactions and jet-wall interactions.
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