In early years, analytical methods were the only means available to render
mathematically an understanding of physical processes involving the moving boundary.
Although analytical methods offer an exact solution and are mathematically elegant, due to
their limitations, analytical solutions are mainly for the one-dimensional cases of an infinite
or semi-infinite region with simple initial and boundary conditions and constant thermal
properties [4]. Practical solidification and melting problems are rarely one dimensional,
initial and boundary conditions are always complex, thermophysical properties can vary with
phases, temperatures and concentration, and various transport mechanisms (for example,
convection, conduction, diffusion and radiation) can happen simultaneously. With the rise
of high-speed digital computers, mathematical modelling and computer simulation often
become the most economical and fastest approaches to provide a broad understanding
of the practical processes involving the moving boundary problems. Nowadays in most
engineering applications, recourse for solving the moving boundary problems has been
made to numerical analyses that utilize either finite difference, finite element of boundary
element methods. The success of finite element and boundary element methods lies in
their ability to handle complex geometries, but they are acknowledged to be more time
consuming in terms of computing and programming. Because of their simplicity in
formulation and programming, finite difference techniques are still the most popular at
the present.
In early years, analytical methods were the only means available to render
mathematically an understanding of physical processes involving the moving boundary.
Although analytical methods offer an exact solution and are mathematically elegant, due to
their limitations, analytical solutions are mainly for the one-dimensional cases of an infinite
or semi-infinite region with simple initial and boundary conditions and constant thermal
properties [4]. Practical solidification and melting problems are rarely one dimensional,
initial and boundary conditions are always complex, thermophysical properties can vary with
phases, temperatures and concentration, and various transport mechanisms (for example,
convection, conduction, diffusion and radiation) can happen simultaneously. With the rise
of high-speed digital computers, mathematical modelling and computer simulation often
become the most economical and fastest approaches to provide a broad understanding
of the practical processes involving the moving boundary problems. Nowadays in most
engineering applications, recourse for solving the moving boundary problems has been
made to numerical analyses that utilize either finite difference, finite element of boundary
element methods. The success of finite element and boundary element methods lies in
their ability to handle complex geometries, but they are acknowledged to be more time
consuming in terms of computing and programming. Because of their simplicity in
formulation and programming, finite difference techniques are still the most popular at
the present.
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