CFX13 01 Intro CFD.ppt

Introduction To CFD 1-* ANSYS, Inc. Proprietary ? 2010 ANSYS, Inc. All rights reserved. Release 13.0 December 2010 Training Manual 1-* ANSYS, Inc. Proprietary ? 2010 ANSYS, Inc. All rights reserved. Release 13.0 December 2010 Chapter 1Introduction to CFD Introduction to CFX What is CFD? Computational fluid dynamics (CFD) is the science of predicting fluid flow, heat and mass transfer, chemical reactions, and related phenomena by solving numerically the set of governing mathematical equations Conservation of mass, momentum, energy, species mass, etc. The results of CFD analyses are relevant in: Conceptual studies of new designs Detailed product development Troubleshooting Redesign CFD analysis complements testing and experimentation by: reducing total effort reducing cost required for experimentation How Does CFD Work? ANSYS CFD solvers are based on the finite volume method The fluid region is decomposed into a finite set of control volumes General conservation (transport) equations for mass, momentum, energy, species, etc. are solved on this set of control volumes Continuous partial differential equations (the governing equations) are discretized into a system of linear algebraic equations that can be solved on a computer Control Volume* * FLUENT control volumes are cell-centered (i.e. they correspond directly with the mesh) while CFX control volumes are node-centered Unsteady Advection Diffusion Generation CFD Modeling Overview Problem Identification Define goals Identify domain Pre-Processing Geometry Mesh Physics Solver Settings Solve Compute solution Post Processing Examine results Update Model Problem Identification Define your modeling goals Identify the domain you will model PreProcessing and Solver Execution Create a solid model to represent the domain Design and create the mesh (grid) Set up the physics Physical models, domain properties, boundary conditions, … Define solver settings numerical schemes, convergence controls, … Compute and monito