**A Numerical Procedure for 2D Fluid Flow Simulation in Unstructured Meshes**

António M. G. Lopes

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http://dx.doi.org/10.5772/63077

#### **Abstract**

The present work addresses the numerical simulation of fluid flow for 2D prob‐ lems. The physical principles and numerical models implemented in the software package EasyCFD are presented in a synthetic and clear way. The 2D form of the Navier-Stokes equations is considered, using the eddy-viscosity concept to take into account turbulence effects upon the mean flow field. The *k-ε* and the *k-ω* Shear Stress Transport (SST) turbulence models allow for the calculation of the turbulent viscosity. The numerical model is based on a control volume approach, using the SIMPLEC algorithm on an unstructured quadrilateral mesh. The mesh arrangement is a nonstaggered type. The coordinate transformation, integration discretization and solution method for the governing equations are fully described. As an example of applica‐ tion, the airflow around a NACA 0012 airfoil is calculated and the results for the aerodynamic coefficients are compared with available experimental data.

**Keywords:** CFD, SIMPLEC, unstructured mesh, fluid flow, 2D simulation
