Moving Mesh and three phase field flow are two different methods used in Comsol for solving fluid dynamics problems. Moving Mesh is a technique that involves continuously changing the mesh structure to adapt to the flow, while three phase field flow is a method that uses a fixed mesh and solves for the fluid flow, phase field, and fluid-fluid interface simultaneously.
Both Moving Mesh and three phase field flow have their own advantages and limitations. Moving Mesh is better suited for problems with complex geometry and large deformations, while three phase field flow is more accurate for problems involving multiphase flows and phase change. The choice of method depends on the specific problem being solved.
Yes, it is possible to combine Moving Mesh and three phase field flow in Comsol to take advantage of their individual strengths. This can be done by using Moving Mesh for the bulk flow and three phase field flow for the interface regions.
In general, Moving Mesh is more computationally efficient as it adapts the mesh to the flow, reducing the number of elements needed. However, for problems with a large number of phases or interfaces, three phase field flow may be more efficient.
The choice between Moving Mesh and three phase field flow depends on the specific problem being solved and the desired accuracy. It is recommended to try both methods and compare the results to determine which one is more suitable for the particular problem.