Team for Advanced Flow Simulation and Modeling
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AHPCRC Bulletin: Summer 1997 - Volume 7 Number 3
1997 Summer Undergraduate Internship Program in HPC in Fluid Dynamics
Mark Wibben (UM)The Summer of 1997 marked the 3rd year that the AHPCRC co-sponsored, along with the National Science Foundation, an undergraduate Summer Internship Program. The Program was designed to encourage undergraduate participation in High Performance Computing (HPC) in Fluid Dynamics, and train future scientists and engineers in HPC research. This past summer there were six participants, each of whom completed a project supervised by an AHPCRC researcher. Projects involved the use of HPC to solve real-world problems in science and engineering. The following students spent ten weeks in Minneapolis working on the projects described.
The flow in this problem was compressible and governed by the Navier-Stokes equations. In Figure 1, the pressure contours in flows past the solid propellant during the firing of the gun are shown. Simulations were run on the CRAY C90 and the Thinking Machines CM-5. The mesh generator and flow solver used in this project were developed by the Team for Advanced Flow Simulation and Modeling (T*AFSM).
Erin Schuster is pursuing a degree from the Massachusetts Institute of Technology in Chemical Engineering. Her supervisors for the project "Mixing During Growth of Single Crystal KDP from Solution: Visualizing Shear Stress" were Andrew Yeckel and Jeffrey Derby (AHPCRC-UM). The objective was to use finite element method to calculate the shear stress exerted on the faces of a potassium dichloride (KDP) single growth crystal spinning in an aqueous KDP
Michelle Viera-Vera is pursuing a degree from the University of Puerto Rico, Mayaguez Campus, in Computer Engineering. Her supervisors for the project "Interactive Visualization of 3D Finite Element Data" were Johnson, Aliabadi, Tezduyar, and Demlow. The objective was to develop interactive software in order to view and properly present 3D finite element flow data. Figure 4 shows flow data at various cross-sections from 3D computation of flow past a cylinder. Colors represent the streamwise component of the velocity. The mesh generator and flow solver used in this project were developed by the T*AFSM.
Mark Wibben is pursuing a degree from the University of Minnesota in Aerospace Engineering and Mechanics. His advisors for the project "Parallel Finite Element Simulation of Parachute Applications" were Keith Stein, an Aerospace Engineer at the US Army Natick Research, Development, and Engineering Center (RDEC) and Tezduyar. The objective was to investigate the performance of a flexible, wing-shaped para-glider. Because of the wing's flexibility, it was necessary to consider the fluid-solid interaction in a system consisting of the wing and the surrounding flow field. It was also desirable to determine what effects the inevitable deformation of the wing would have on the performance, namely, the lift-to-drag ratio (L/D).
The project consisted of two parts. The first part involved investigating the effects of flexibility on a wing section. Meshes were generated with different degrees of spanwise curvature and input into a flow solver based on the Navier-Stokes equations. It was shown that L/D decreased with increasing spanwise curvature for a given angle of attack.
The second part of the project involved the creation of a 3D mesh of the entire flexible wing. This mesh was input into the same flow solver as the one used for the previous meshes. The resulting pressure distribution and the geometry of the wing were input into a structural dynamics code, along with material properties, to update the geometry for the wing. This refined geometry was input back into the flow solver. This process was repeated until a single, converged solution was obtained. In this fashion, the performance of the wing was determined. Figure 5 shows the finite element mesh, surface pressure distribution, and streamlines. The mesh generator and flow solver used in this project were developed by the T*AFSM.
A national competition for selecting the interns for the 1998 Summer Undergraduate Internship Program in Fluid Dynamics will conclude in February 1998. Six interns are expected to participate in the Program, which will be held 15 June through 21 August. The 1998 summer projects are listed in Table 1.
Table 1. 1998 Summer Internship Projects.
Interactive Visualization of 3D Finite Element Data
Andrew Johnson, Aerospace Engineering and Mechanics (UM)
Shahrouz Aliabadi, Engineering (CAU)
Tayfun Tezduyar, Aerospace Engineering and Mechanics (UM)
Parachute Fluid–Structure Interactions—Response of Parachutes to Adverse Flow Conditions
Simulation of Free Surface Flows in Channels
Parallel Computation of Wake Flows Affecting Secondary Objects
Extraction and Visualization of Data Sets Generated in Complex, 3D Finite Element Flow Simulations
Finite Element Simulation of Fluid Flows and Moving Structures