Free UGRID Grid Generation Program

Version 7.0 for Microsoft Windows
with increased maximum grid size and improved IO.

UGRID features fast generation of 2D unstructured, structured, and hybrid meshes about airfoils and circles. The CFD utility reads coordinates describing a foil from a file and quickly creates your. You can produce Euler grids or can incorporate a structured or an unstructured grid to resolve the boundary layer in Navier-Stokes calculations. The unstructured grids are extremely smooth and are symmetric if the airfoil is symmetric.

A graphical user interface simplifies entry of the number of foil points, number of points at the farfield, the farfield radius, and other parameters. You can set boundary layer thickness and cell size distribution or use default values. You can concentrate cells at the trailing edge of an airfoil and along the wake.

You can point and click to centre a grid feature of interest on the screen and can zoom in for a close look. You can display the cell, cell-edge, or node numbers on screen for reference. You can work on two grids and switch quickly back and forth between them for comparison.

When you are satisfied with a grid you can store its coordinates in an ASCII file that can be read on any machine. You can save the picture on the screen to a file.

The program can produce unstructured grids

[Picture of unstructured grid about RAE2822 airfoil (15K)]

featuring very smooth outer and inner meshes, each with a constant number of triangular circumferential cells.

[Detailed view of unstructured grid about NACA 0012 airfoil (21K)]

The outer and inner meshes are separated by a transition mesh where the number of circumferential cells is reduced as the outer mesh is approached.

To resolve boundary layers in laminar or turbulent flows, UGRID can produce structured meshes with very fine line spacing in the radial direction near the airfoil.

[Detailed view of structured grid about RAE2822 airfoil (13K)]

or it can produce a hybrid structured/unstructured mesh with considerably fewer nodes.

[Detailed view of hybrid grid about RAE 2822 airfoil (19K)]

An unstructured boundary-layer mesh can also be produced.

[Detailed view of unstructured grid about NACA 0012 airfoil (18K)]

The program runs on 32 bit Pentium 3 and Pentium 4 PCs running the MS Windows XP and earlier operating systems. It runs on a 64 bit Intel Quad Core PC running the MS Windows Vista operating system and a 64 bit Intel Core i7 PC running the MS Windows7 operating system. Please try the demo to check how it runs on your machine. The download includes airfoil profiles that can be read by UGRID using a number of standard formats. The demo program is free. I have recently made substantial improvements for unstructured grids and have modified the program to output grids with more than 32k nodes. I am considering charging a license fee. If you like the demo, send an email for free two month license to use the beta version. You will be asked to fill out a survey.

Terms of Use and Installation Instructions

Download UGRID version 7.0 (1.644K)

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Last changed on July 12, 2011.