1 / 5

A Computational Framework for Simulating Flow around Hypersonic Re-Entry Vehicles

A Computational Framework for Simulating Flow around Hypersonic Re-Entry Vehicles . Current challenges in computational aerothermodynamics (CA) Efficient generation of unstructured grids to resolve complex geometry Higher order discretization schemes for shock capture

havard
Download Presentation

A Computational Framework for Simulating Flow around Hypersonic Re-Entry Vehicles

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Computational Framework for Simulating Flow around Hypersonic Re-Entry Vehicles • Current challenges in computational aerothermodynamics (CA) • Efficient generation of unstructured grids to resolve complex geometry • Higher order discretization schemes for shock capture • Laminar to turbulence transition models • Reactions due to dissociation of air • Thermodynamic non-equilibrium • Spectral radiation • Solid deformation due to ablation David Stroh, Anthony Marshikand GauthamKrishnamoorthy,UND Chemical Engineering • Long term goal: Development of add-on modules/functions and best practice guidelines • that extends the capabilities of commercial codes to study (CA) problems • Short term goal: • Infrastructure: Software licenses (ANSYS FLUENT, ANSYS AUTODYN) • Sandia’s DAKOTA tool kit for uncertainty quantification • Training of students • Software validation of unit problems

  2. Relevance to NASA • Directly relevant to the mission of NASA’s Division of Atmospheric and Planetary Sciences. • A hierarchial validation approach ranging from unit problems to more complex problems • Validations accomplished through comparisons against experimental data and predictions from NASA’s in-house CA codes: • LAURA: Hypersonic flows • ANSYS FLUENT has additional transitional turbulence modeling options • SAS and embedded LES options can resolve global instabilities and turbulent structures • Additional “vibrational temperature” transport equation will be solved • NEQAIR: 1D line-by-line Radiative transportmodel (> 200,000 spectral intervals) • 2D/3D calculations in ANSYS FLUENT account for shock curvature • Tighter coupling with fluid flow • Speed up spectral calculations by reducing it to a few 100 intervals • CMA, FIAT: Material response • Tighter coupling with fluid dynamics • Stronger deformations can be handled through the explicit solver in ANSYS AUTODYN

  3. Accomplishments Task 3 • Training of UGRAs • Tasks: • Task 1: Laminar flow over bluntcone • Task 2: Transitional flow over flat plate • Task 3: Surface heat transfer and real gas over a sharp cone • Backward and forward facing steps • Flow over Mach 20 spherical blunt cone • Task 4: Chemistry • Task 5: Plasma torch problem for Radiativeheat transfer (in progress) Task 2 • Newer transitional models are very promising! • Investigating sensitivities to turbulence • boundary conditions Spherically blunt cone

  4. Student involvement • Use of commercial tools speeds up the learning process. • Two UG research assistants (David Stroh and Anthony Marshik) were employed full-time over Summer 2011 • They were trained on the numerical aspects of computational fluid dynamics • They developed a theoretical understanding of boundary layer flows • They developed and demonstrated extensive familiarity with the commercial code ANSYS FLUENT • Manuscript in preparation for submission to AIAA Journal of Spacecraft and Rockets

  5. Future plans for proposals • NASA NRA – Research Opportunities in Aeronautics • Air Force BAA (Aerospace, Chemical and Material Sciences) - 2012 • NSF Fluid Dynamics Program (Feb 2013)

More Related