The ADS flow solver, Code Leo, is a fast and accurate solver for general flow configurations. It solves the Reynolds' Averaged Navier-Stokes equations numerically. Tempered by decades of cutting edge aerospace application, Code Leo is designed to cover a wide range of Mach numbers from 0.005 to 3.5, and accepts both structured and unstructured mesh as input to support a large class of flow problems.

Though Leo is a generalized flow solver, it is particularly adept at addressing turbomachinery-class problems. It is capable of handling anything from 2D cascade simulation on a desktop to large scale, multi-stage time accurate simulations across a cluster of high performance servers. Code Leo has been applied to a wide variety of axial and radial turbines and compressors, wind turbines and high performance jet engines.

Code Leo employs cell vertex-based finite volume approximation to solve the governing equations. The cell-vertex approach has proven to be more accurate for stretched/skewed grids and is 4-6 times more memory efficient than comparable cell-centered techniques.

In addition, Leo employs a proprietary distribution formula to ensure the proper propagation of convection and pressure waves. In contrast to cell-centered schemes, our approach does not require 4th order smoothing as a necessity to achieve solution convergence.  This results in a procedure we feel to be more physics-based in nature and more likely to deliver quality results.

Overall, the numerical procedure is second order accurate in space and time, even for highly skewed meshes. This is a real advantage over cell-centered approaches which require meshes that are second order accurate in space.

We apply a number of techniques to achieve fast turnaround time.  Local time stepping is employed, as well as pre-conditioning with gauge pressure to speed up convergence for low speed flow problems.  We also employ two convergence acceleration techniques: a residual propagation method for unstructured mesh, and a multi-grid scheme for structured mesh.  For time accurate simulations that employ wall integration, we employ dual time stepping to facilitate convergence.

Finally, for highly skewed meshes, our cell-vertex numerical scheme produces accurate results with fewer elements compared to cell-centered schemes.  The need for fewer elements under this condition also results in improved turnaround time.

Here at ADS we've worked hard to impart the experiences we've gained designing commercial and military grade turbines and compressors. We think Code Wand is best in class--not because of fancy bells and whistles, but because Wand knows how to concentrate mesh nodes where they're needed most for your design needs.

We start by employing a dense OHH-type mesh topology to ensure the capture of flow phenomena near leading and trailing edges. This is coupled with an innovative clearance meshing algorithm that helps to improve the efficiency and performance of tip clearance and stator end gap meshes.

While we provide presets, you can precisely control the placement of mesh nodes across the flow field.

No.  While we believe that Code Wand is "best-in-class" at turbomachinery blading problems, our solver can be applied against 3rd party meshes via CGNS.

All ADS products are currently supported on 32-bit Windows and 32/64-bit Linux (RHEL 4 and 5). For server-based configurations, you will need a Linux machine to act as a license management server for the ADS products.

Code Wand can accept a wide range of 2D/3D airfoil geometry formats as input, including:

2D

• (x₁,y₁,y₂)
• (x,y) at constant radius
• (x₁,y₁,x₂,y₂)

• (x₁,r?₁,r?₂)
• (x,r?) at constant radius
• (x₁,r?₁,x₂,r?₂)
• (x₁,r?₁,x₂,r?₂,r₁,r₂)
• (x,r?,r)
• (x₁,?₁,r₁,x₂,?₂,r₂)
• (-y₁,x₁,-y₂,x₂)
• (x₁,y₁,z₁,x₂,y₂,z₂)
• (x₁,r?₁) all

Seeing is believing, so we've tried to make the process pretty easy for you.  Check us out, register to our site to download an evaluation, and follow the installation procedure to request a 30 day evaluation license.   If you like what you see, subscribe to use our products on a monthly basis and scale as your needs scale.

We license our products on a monthly subscription basis.  

The ADS Desktop Edition is intended for design shops whose CFD analysis needs can be addressed on a single multi-core machine.  The Desktop Edition is available for Windows and Linux and includes Code Wand, the ADS Workbench and a node locked license to run Code Leo on up to four concurrent cores. Pricing: $2,000 per month.

The ADS Enterprise Edition is a server-based product that enables organizations with more demanding design needs. The Enterprise Edition includes the ADS Workbench and floating licenses for Code Leo and Code Wand. Pricing starts at $4,000 per month and scales based on the number of concurrent cores licensed for Leo and the number of concurrent users required for Wand.

The license manager must run on a server that is accessible to the target Windows machine via DNS.  If the license manager hostname is adslmhost you will need to edit the following entries environment variables [ADSCFDLM_LICENSE_FILE, LM_LICENSE_FILE].  Set them to @adslmhost. 

There is currently no plan for a Windows version of the Enterprise License Manager.

The license manager runs on Red Hat Enterprise Linux 4 and 5.  

You can download the MPICH2 source from:http://www.mcs.anl.gov/research/projects/mpich2/downloads/index.php?s=downloads

Yes.  There are other implementations of MPICH that use mpiexec and mpirun as their execution commands.  Leo parallelization is currently only compatible with MPICH2 from Agronne Labs.

This only occurs in Windows.  Please use your Windows login name and password.

It is possible that the response was filtered into SPAM. Please check there. If it is not there, please contact operator@adscfd.com.

The ADS tool suite binds the executables to a network card present on your computer. If this card is removed, the executables will stop working. It is advisable to select your ethernet card, as it is usually part of the system board.

The request license tool requires some visual studio libraries. You can install them by running C:\Program Files\ADS\tools\microsoft\msvc2008\vcredist_x86

In order to create the .lic files, the user must have write permissions to the /tools directory.  In linux, please make sure the permissions are correct.  If you are running Windows Vista, you may have to Right-Click on the request-license.bat tool and select "Run as administrator".