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Small Business Innovation Research/Small Business Tech Transfer

Free-Surface Modeling of Cryogenic Fluids Using a Higher-Order, Unstructured Grid Volume-of-Fluid (VOF) Method

Completed Technology Project

Project Description

Free-Surface Modeling of Cryogenic Fluids Using a Higher-Order, Unstructured Grid Volume-of-Fluid (VOF) Method
Accurate and efficient computational modeling of free-surface flows has numerous applications of current and future relevance to NASA. At present, NASA engineers use several commercial codes for modeling cryogenic fluids. However, the free surface modeling technologies in these codes need improvements for better solution accuracy, and most are not scalable for highly parallel simulations. In this SBIR project, CFDRC and Streamline Numerics will develop and implement, in Loci-STREAM, an innovative and improved VOF methodology with the following advanced features: (1) Ability to handle triangle and quadrilateral cell types in 2-D, and tetrahedron and hexahedron cell types in 3-D; (2) Spatially second-order surface reconstruction for these cell-types; (3) Hybrid implicit-explicit time integration scheme that both maintains a sharp interface and allows realistic time-steps for the overall flow solver; and (4) Highly efficient parallelization with scalability to 1000s of processors. To demonstrate feasibility in Phase I, a previously developed 2-D stand-alone VOF module will be coupled to Loci-STREAM and validated. In Phase II, 3-D VOF capability will be developed and integrated with Loci-STREAM. An innovative multi-timescale algorithm that affords significantly larger time steps than standard VOF will also be implemented. Final demonstration of the software will be performed for practical cases to be decided in discussions with NASA/MSFC personnel. More »

Anticipated Benefits

Primary U.S. Work Locations and Key Partners

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This is a historic project that was completed before the creation of TechPort on October 1, 2012. Available data has been included. This record may contain less data than currently active projects.