Automated Validation of CFD Codes for Analysis of Scramjet Propulsive Flows Using CRAVE
45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit
This paper discusses the CRAFT Tech Automated Validation Environment (CRAVE) for the analysis of scramjet propulsive flows. CRAVE is web-based and GUI driven, with server and file storage hardware hosted by CRAFT Tech. The initial emphasis of the work described has been that of utilizing CRAVE to support the validation of CFD codes for analyzing fundamental high speed fuel/air mixing data sets, as a building-block towards analyzing realistic scramjet combustor flowfields. Validation data sets
... idation data sets include fundamental fuel/air mixing data (shear layer, coaxial jets) as well as varied fuel injection mixing problems (with flush mount and in-stream injectors). Data sets with and without combustion are included and supplemental LES data sets are also included. These provide additional details of turbulent statistics, and in particular scalar fluctuation details which are being used to support the validation of scalar fluctuation models which predict local values of turbulent Prandtl (Pr t ) and Schmidt (Sc t ) numbers. A key feature of CRAVE is the inclusion varied data sets along with accompanying benchmark CFD solution files and specialized scripts to automate comparisons of CFD solutions with the data. If new turbulence models are being investigated, their performance for selected cases can be quickly evaluated in a fully-automated manner with grids, input files, etc. already available from earlier solutions. Multiple calculations can be performed in an automated sequential manner, and comparisons with both the data and with solutions using other turbulence models or other CFD codes are available at the completion of each run. This paper will describe the overall features of CRAVE, the various data sets now available for validation, and will go over how it is used in a web-environment. A Beta version is operational and is being used by the Air Force and interfacing procedures are being developed for its use with a number of CFD codes. Other types of data sets are also being incorporated for different classes of problems (hypersonic transition, plumes and base flow, etc). A related paper by Ungewitter et al. presented at this meeting discusses the analysis of several new fuel/air injection mixing data sets that are being incorporated into CRAVE.