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### Table of Contents

# OpenVSP CFD Meshing Guide

This section of the wiki aims to give a basic understanding of the CFD Meshing interface within OpenVSP. Throughout this interface, it is important to make the distinction between a “scaled” and “un-scaled” parameters. In this context, scaled means that the parameter value is in the scale of the given geometry. This means that the value is in the scale of the current geometry. Un-scaled parameters, however, are relative to the current geometry's scale. Therefore, any value given to them will hold its meaning regardless of the size of the input geometry.

Once you have created your own geometry or have download a geometry from the hangar, you can create a triangulated surface mesh for use in CFD. To begin, open the CFD Mesh interface from the Geom pulldown menu. The CFD Mesh interface will then open, and you will begin on the “Global” tab. Along with this, there are tabs for “Display”, “Output”, “Sources”, “Domain”, and “Wakes”. The choices and parameters to be set within each will be discussed below.

### Global Tab

This is the first grouping of parameters when the CFD Mesh interface is opened. It includes the basic parameters that are necessary to define a mesh. These parameters include:

- Maximum Edge Length
- Minimum Edge Length
- Maximum Allowable Gap
- Number of Circular Segments
- Growth Ratio Limit

Among these, the parameters for Maximum Edge Length, Minimum Edge Length, and Maximum Allowable Gap are scaled parameters. Number of Circular Segments and the Growth Ratio Limit are non-scaled parameters.