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cz295 committed Nov 16, 2023
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2 changes: 1 addition & 1 deletion _pages/cv.md
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layout: cv
permalink: /cv/
title: cv
nav: true
Nev: true
nav_order: 2
cv_pdf: Zekang_Cheng_2023.pdf
description:
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2 changes: 1 addition & 1 deletion _projects/bouncing.md
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Droplet collision occurs frequently in many natural and industrial processes, for example, the formation of raindrops, spray and atomisation. This problem
can be characterised by a dimensionless number, the <i>Weber</i> number. Experimental studies on the head-on collision of droplets of equal size have
identified four distinct outcomes with increasing values of <i> We </i> number: 1) coalescence after minor deformation; 2) bouncing; 3) coalescence after large
deformation; and 4) coalescence followed by separation with the generation of secondary droplets. We are interestd in the determining force from regime 1) and regime 2).
deformation; and 4) coalescence followed by separation with the generation of secondary droplets. We are interested in the determining force from regime 1) and regime 2).
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The gas film between the two droplets play an important role
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2 changes: 1 addition & 1 deletion _projects/dripping.md
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The formation of droplets from a faucet is widely observed in everyday life. At the end of a tap, a pendant drop forms and grows very slowly until
its size exceeds a certain limit. The droplet elongates, forms a neck in the middle and eventually detachs from the faucet. The final breakup process
its size exceeds a certain limit. The droplet elongates, forms a neck in the middle and eventually detaches from the faucet. The final breakup process
is a critical phenomenon connected to a singularity of the nonlinear Navier-Stokes equation with interface. It is a challenging issue to address for
a numerical or analytical method.
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2 changes: 1 addition & 1 deletion _projects/mesh.md
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In multiphase flows, the key factor is the presence of an interface separating different phases. Many physical properties, for example density and viscosity, are discontinuous across the interface. The interface also possesses localised properties including the interfacial tension. Furthermore, owing to the fact that the interface is a moving boundary, the evolution of the interface is coupled with the velocity field and pressure, and all of these must be determined simultaneously.
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We adopted an approach to track the interface explicitly on a unstructured triangular mesh. An adaptive moving mesh generator was developped to follow the interface evolution and to constanly refine/coarse the compuational mesh. In general, finer mesh is required near the interface as interfacial tension is the driving force in problems we interested in. Applying a coarser mesh in regions far away from the interface also reduces the computing costs.
We adopted an approach to track the interface explicitly on a unstructured triangular mesh. An adaptive moving mesh generator was developed to follow the interface evolution and to constantly refine/coarse the computational mesh. In general, finer mesh is required near the interface as interfacial tension is the driving force in problems we interested in. Applying a coarser mesh in regions far away from the interface also reduces the computing costs.
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