Simplify the problem - Simplify geometry > Ignore features that do not affect the flow > Use as many blocks as possible to set the geometry > Make blocks meet at complete faces

The geometry is a set of hexahedral solids which have a logical representation. Each block in the geometry is called a ‘solid’. Each solid in the geometry can represent a fluid, porous or solid region

一、边界条件 二、物理现象 三、流体属性，诸如密度、粘度等

The user FORTRAN routines are used for - Complex features not available through the command language > Non-uniform velocity profiles, variable material properties, moving grid, etc…

AEATECHNOLOGY ENGINEERING SOFTWARE Performing a CFD Analysis Define the problem Geometry Domain in which the governing equations will be solved and solutions obtained

Main Objective: Build a viable domain (B-rep solids, cutout solids, simple solids) B-rep (Boundary Representation) solids are composed of simple and/or trimmed surfaces Simple (Parametric) solids have cubic topology Multiple solids must connect at whole faces Surface and face congruency and parameterization must be kept in mind or the mesh quality will suffer

Computational Fluid Dynamics (CFD) Simulation of fluid flow, heat transfer and mass transfer processes CFD involves the numerical solution of the governing equations Mass continuity

Domains represent 3D regions where governing equations are solved Domains can be comprised of more than one solid joined together Domains can also contain internal 3D regions Cutouts- solid obstacles to flow Sub -domains- Fluid sub-domains: volumetric sources/sinks of mass. heat

Create a solid which defines the region of interest. Define the fluid domain in terms of flow region, physical models, and fluid properties. Apply boundary conditions to fluid domain surfaces. Specify an initial guess/condition for the simulation

Boundary conditions are required to set on all external domain boundaries Initial values/guess are required to set for all calculations Boundary conditions and initial values/guess can be either constants or expressions