You can also create special boundary layer meshes, which are suitable for resolving boundary layers in fluid flow. They typically consists of narrow layers of quadrilateral elements along the boundary. Finally, adaptive mesh refinement is available as a solver option for stationary and eigenvalue solvers. The mesh is then adapted based on an error estimate during the solution stage.

Computer simulation has become an essential part of science and engineering. Digital analysis of components, in particular, is important when developing new products or optimizing designs. Today a broad spectrum of options for simulation is available; researchers use everything from basic programming languages to various high-level packages implementing advanced methods. Though each of these techniques has its own unique attributes, they all share a common concern.COMSOL Multiphysics is a comprehensive simulation software environment for a wide array of applications, but structured and user-friendly for all to use.. This is why we have created a video that gives you a brief overview of the capabilities you can possess with the software in your hands. Engineers and scientists have long had to make assumptions in order to be able to realize their design ideas. As time progresses these assumptions are being refined — and in some cases even eliminated — allowing for more accurate results. Multiphysics is one major enabler in eliminating assumptions. How? By coupling related physical applications together to include all the necessary factors for a complete model. COMSOL Multiphysics is a simulation software designed to provide the most accurate results by minimizing the assumptions its users must make.

COMSOL primarily uses the finite element method (FEM) to compute single- and multiphysics simulations. Whenever you use the finite element method, it is important to remember that the accuracy of your solution is linked to the mesh size. As mesh size decreases towards zero (leading to a model of infinite size), you move toward the exact solution for the equations you are solving. However, since we are limited by finite computational resources and time, you will have to rely on an approximation of the real solution. The goal of simulation, therefore, is to minimize the difference (“error”) between the exact and the approximated solution, and to ensure that the error is below some accepted tolerance level that will vary from project to project based on your design and analysis goals.

You will need to track a characteristic output parameter from your simulation as you vary the mesh size and determine at which mesh size the parameter has “converged” on the correct value. Note that “converged” is used in quotation marks because the convergence criteria will depend on your design and analysis goals.

You can read the step-by-step instructions below to learn how to perform a mesh refinementstudy. You can also watch the archived Postprocessing and Visualization webinar below to see how the steps are carried out on a megaphone geometry.

Dear Aparna Excelent answear also check this links maybe help you

http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=DDC995914D76AC234940624F669BDA9A?doi=10.1.1.718.4458&rep=rep1&type=pdf

https://www.comsol.com/blogs/how-to-implement-mesh-refinement-study/

https://link.springer.com/content/pdf/10.1007/s13320-016-0323-y.pdf

https://www.sciencedirect.com/science/article/pii/S221418041530026X

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