Tips & Tricks

Making it Easy to Add a Box Source in CFD-VisCART

Sources are used in CFD-VisCART to refine the grid in localized regions of the domain. One of the many types of sources available is the Box Source where the user specifies a cuboid box around the region a finer grid is required. In the earlier versions, the user would have to add a Box Source and then specify its X, Y and Z extents to position the box in the desired location.

Using the Construction Plane in CFD-GEOM

Point entities in CFD-GEOM are placed in an XYZ (Cartesian) coordinate system. The Construction Plane tool enables you to position a plane in space, and place points on that plane to generate curve entities.

Hole Detection Feature in CFD-VisCART

CFD-VisCART can handle geometries with small gaps, cracks and overlapping parts, but what if there is a big hole or opening in one of the parts that the user is not aware of? The grid will flow through this opening and the result will be a mesh that has cells both inside and outside the model. This leaves the user with the near impossible task of finding this opening. In CFD-VisCART, a Hole Detection feature has been introduced that performs this task for the user.

Distance Measuring Tool in CFD-VisCART

CFD-VisCART has a simple and easy-to-use tool for measuring the distance between two points in a geometry. This tool can be found under the Geom tab.

CFD-GEOM Viewer Hot Keys

Most of the time users deal with real world problems which are usually 3D. 3D geometries and grid generation can be difficult to mesh depending on the complexity of the geometry. Working with 3D geometry and grid generation can be made lot faster with effective use of the Hot Keys available in CFD-GEOM.

Surface Projection in CFD-GEOM

The Project Surface tool of CFD-GEOM allows the projection of a single surface onto a collection of surfaces. The collection of surfaces may contain gaps and overlaps, and the resulting projected surface will then covers these imperfections.

Using Radial Extrusion in CFD-GEOM

The Radial Extrusion tool allows you to extrude structured faces and unstructured surface grids about a specified axis. Extrusion is performed radially about a user-specified axis, typically the center line of the collection of entities being extruded. A variety of options exist for specifying the reference axis and for controlling certain aspects of the extrusion.

Using Interior Sources for Mesh Control in CFD-GEOM

To produce accurate simulation results, it is important to provide adequate mesh resolution in the areas of the model where steep solution gradients are expected. In CFD-GEOM, there are a number of tools available to achieve mesh refinement. One such tool for refining unstructured grids is the interior source option.

CFD-GEOM Filters

Sometimes during the creation of a geometric model it is possible to have overlapping (duplicate) points, line, edges, and faces. This can also occur when CAD files are imported into CFD-GEOM. The user usually finds this situation when trying to do additional operations in CFD-GEOM.

Structured grid in a triangle using CFD-GEOM

CFD-GEOM can create a structured face on a geometry using four edge sets that form a closed circuit. If less than four edge sets are present for the geometry, for example three in a triangle, CFD-GEOM will create a degenerate face at the intersection of the first and third edge sets, as shown Figure 1.