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Can someone please tell me a basic and easy-to-understand example of Residual in CFD?
Thank you
Thank you
The residual in Computational Fluid Dynamics (CFD) refers to the difference between the computed and actual values of a physical quantity. It is a measure of the accuracy of the numerical solution obtained from a CFD simulation.
The residual is calculated by taking the difference between the computed value and the exact or known value of a physical quantity at a given point in the computational domain. This calculation is repeated for all points in the domain, and the residuals are then summed to obtain an overall measure of the accuracy of the solution.
A high residual value indicates that the solution obtained from the CFD simulation is not accurate. This could be due to a variety of factors such as numerical errors, inadequate mesh resolution, or incorrect boundary conditions. It is important to minimize the residual values to obtain a reliable and accurate solution.
The residual can be reduced by improving the numerical scheme used for solving the governing equations, increasing the mesh resolution, and ensuring that the boundary conditions are properly defined. It is also important to validate the results by comparing them with experimental or analytical data.
No, it is not possible to have zero residual in CFD simulations. This is because CFD solutions are always approximations and are subject to errors. However, the goal is to minimize the residual values as much as possible to obtain a reliable and accurate solution.