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It tracks the moving boundary using triangulated surface grids and solves the flow governing equations on a stationary Cartesian grid.
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The main difficulty related to simulation of moving boundary problems using immersed boundary techniques is the loss of conservation of mass, momentum and energy during the transition of numerical grid cells from solid to fluid and vice versa.
The handling of moving boundaries tracked using a narrow-band level set technique leads to issues peculiar to the multi-processor environment.
Specification of both boundary point distribution on all sides and moving boundaries is used.
A moving boundary method is used to describe the movement of boundaries across these regions.
Here a moving boundary model is used and adapted to simulate and compare the transient behavior of a microchannel evaporator with a fin-and-tube evaporator for a residential air-conditioning system.
In process of dealing with this moving boundary condition, we use a trick of introducing two transformations to convert moving boundary to nonclassical boundary that can be handled with Ritz-Galerkin method.
We find that, in the moving boundary case, the use of Crank Nicolson time discretization is unstable, requiring us to use the L0-stable implicit Runge Kutta method of Twizell, Gumel, and Arigu (1996, Adv. Comput. Math.6, 333).
The Laplace equation of a moving boundary problem is solved using the finite element method by adopting an efficient re-mesh algorithm.
The moving boundary capability can be used to construct a numerical wave maker in a wave basin which could be used for a numerical study of wave-breakwater interactions.
A lumped parameter moving boundary modeling framework is used to model the two heat exchangers in the VCS.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com