Cart3D

Whether you’re using Cart3D for preliminary design or shape optimization, you may be producing hundreds of CFD runs per day. Chorus provides a unified framework for you to quickly understand your design space and interrogate individual CFD runs.

Tecplot 360 helps you evaluate CFD field data. Cart3D output can be easily read by Tecplot 360. Residuals are written in Tecplot ASCII friendly format. Surface and Volume data may be written in Tecplot (.plt) or TRIX format. Tecplot 360 2017 R1 introduced the TRIX loader. Chorus also includes a TRIX loader.

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It’s all about increased efficiency. The software allows us to automate the process of simultaneously comparing the results from different CFD simulations. This greatly accelerates the pace at which we can identify anomalies and validate or disprove our CFD results.”

–Spencer Fugal of Aerion Technologies

Aerodynamic Performance

If you’re investigating aerodynamic performance, Tecplot 360 with Chorus can help you identify anomalous results by viewing easy-to-create 2D scatter plots and CFD image results simultaneously. You can dive into your Cart3D results with Tecplot 360 – whether those results are in Tecplot format or TRIX format.

Optimization

If you’re doing shape optimization, Tecplot 360 with Chorus provides an environment that allows you to understand the path of your optimizer and perform trade studies. You will be able to simultaneously view the inputs and outputs of your optimization study along with image results.

Cart3D Datasets

Both of these datasets are actual Cart3D results. The first was supplied to us by NASA. The second dataset we created using Cart3D.

Scripts and Macros Help with Cart3D Results

This script will crawl the folder it’s in and extract input and output values from the various files produced by Cart3D. The result of this script is a CSV file which can be read into Chorus. This script may be shared with other users, but it is specific to the Delta Wing dataset. Some modification will be necessary for it to work with other Cart3D projects. Python script to crawl Cart3D Folder (1.5KB ZIP)

Three files, forces.mcr, moments.mcr, history.mcr, are designed for Create Images operations to be used with forces.dat, moments.dat, history.dat. These scripts will generate images that show the last 10% of data points in these files and provide a useful spot check of convergence for the Cart3D user. Macro template files to view residuals (1.9KB ZIP)

WHAT IS CART3D?

Cart3D is a NASA code frequently used for preliminary design and shape optimization for objects in high-speed flows, such as supersonic and hypersonic aircraft. It is a fast code and is good at resolving flow features, like shock, due to adjoint-driven mesh adaptation (The Adjoint Method is the quickest way to build a robust mesh for arbitrary complex geometries).

CART3D RESOURCES