Computational Modeling Software  

Combustion Research and Flow Technology, Inc., (CRAFT Tech) 

Pipersville, PA 
 

INNOVATION 

The technology is a generalized multi-element unstructured framework (CRUNCH CFD® code) with integrated sub-models for grid adaptation, grid movement, and multi-phase flow dynamics including cryogenic cavitations. Cryogenic (super cold) environments, such as those with liquid hydrogen and liquid oxygen as used in the RS-68 and J2-X engines, present a particular challenge with regard to modeling and simulation. The CRUNCH CFD® code software has been enhanced with special emphasis on advanced models for supersonic diffuser design, steam ejector (used to decrease ambient pressure to simulate high altitude) performance, spray nozzle cooling efficiency, plume aspiration dynamics, and isolation valve operation.

• The enhanced CRUNCH CFD® code has been demonstrated in evaluating the flow fields in the A-3 high altitude testing facility, which is currently under construction at the NASA Stennis Space Center. High fidelity numerical analyses were performed on the J-2X engine exhaust plume operating with the supersonic diffuser and thermal and pressure loads on the diffuser wall and the test cell. Calculations were also performed on the engine exhaust plume in the facility operating with the steam ejectors.

• The suite of computational tools impacts a broad segment of the commercial market that includes the general area of rapid response control valves, including steam ejectors, in industries as diverse as chemical process plants, manufacturing facilities, and aerospace propulsion test facilities.  The software can be used as a diagnostic tool in predicting system instabilities and identifying dominant modes for structural excitation, thereby improving safety in nuclear, aerospace testing, and process facilities.  The CRUNCH CFD® code software can also be used for improving the design and efficiency of jet pumps, ejectors, etc, which benefits a wide range of applications including refrigeration, air conditioning, power generation, and oil & natural gas extraction and processing.  

• The enhanced CRUNCH CFD® code will directly impact analysis in the design and operation of rocket engine test facilities, such as NASA’s A-3 test facility for the upper stage J2-X engine and the B-2 test facility for the RS-68 five engine cluster. These engines will enable NASA’s return to the Moon and an eventual trip to Mars.

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