18 Jan

Announcing the Release of Heartwood Analytics™ Birch

The healthcare analytics and informatics markets are projected to grow to over $20 Billion by 2020, but for many the payoff from this investment has been elusive. Purchasing the latest Electronic Health Records (EHR) system, buying a new analytics platform, or paying for data consultants, are expensive trends that are grounded in genuine industry needs for reduced costs and better outcomes.

23 Dec

Shock Wave / Laminar Boundary Layer Interaction with Real-gas Effects Presented at AIAA Aviation 2014

Experimental studies have been conducted in the LENS-XX expansion tunnel facility to generate datasets for shock wave / laminar boundary layer interactions at flight-duplicated conditions. These cases are at high enthalpy conditions where laminar separated regions are influenced by thermal and chemical excitation.  Detailed surface heat transfer and pressure measurements have been measured for 25O/55O double cone and a 30O hollow cylinder flare configurations for a range of freestreram velocities from 3 km/s to 6.5 km/s.  Details of the model configurations and the freestream conditions at which these studies have been conducted, together with earlier measurements and measurements upstream of the interaction regions were presented to enable computations to be performed with both Navier-Stokes and DSMC prediction methods for “blind comparisons” with the experimental data.  Details of the experiment, the comparisons with state-of-the-art CFD codes, and tabulations of the data are given below.


Presentation and Datasets:

Experimental Overview and CFD Comparison Presentation
Double Cone Dataset
Hollow Cylinder Flare Dataset
Experimental Overview Paper

23 Dec

Shock Wave/Turbulent Boundary Layer (SWTBL) Study Presented at AIAA Aviation 2014

Experimental studies have been conducted to obtain detailed heat transfer and pressure measurements in regions of shock wave/turbulent boundary layer interaction over cone/flare and hollow cylinder/flare configurations in high Reynolds number hypervelocity flows for comparison with computations with CFD codes employing a range of turbulence models. These studies were conducted at a series of Mach numbers between 5 and 10, in cold flows and in flows with duplicated flight velocities in fully turbulent flows. Schlieren photographs of the interaction regions and detailed surface pressure and heat transfer measurements were made through the separated interaction regions as well as upstream and downstream of the interactions which provide well-defined boundary conditions for a range of Reynolds numbers under cold freestream flow ( Tw=100 R) and conditions for total enthalpies duplicating flight. The large scale of the models used in these experiments enabled us to obtain measurements in fully turbulent flows with the length of turbulent flow up to 1,000 boundary layer thicknesses downstream of the beginning of untripped transition. The surface measurements obtained in these studies together with Schlieren and interferometry measurements of the regions of shock wave/boundary layer interaction were originally assembled to provide data sets for “blind” code validation studies. Both sets of measurements have been compared with calculations with the major codes using a number of turbulence models by knowledgeable researchers and this information is available via links below as are tabulations of the measurements presented in the paper.

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