Dr. Jay Boris, CTA Leader

AN OVERVIEW OF THE CFD-CTA

Computational Fluid Dynamics is one of ten computational technology areas (CTA's) in the DoD High Performance Computing Modernization Program (HPCM). The Computational Fluid Dynamics CTA employs digital computers and numerical methods to solve the equations describing fluid and gas motion. CFD is used for basic studies of fluid dynamics, for engineering design of complex flow configurations, and for predicting the interactions of chemistry with fluid flow for combustion and propulsion. It is also used to interpret and analyze experimental data and to extrapolate into regimes that are inaccessible or too costly to study.

Work in the CFD-CTA encompasses all velocity flow regimes and scales of interest to the DoD. Incompressible methods are appropriate for low speed, e.g., governing the dynamics of submarines, slow airplanes, pipe flows, and air circulation. Compressible flows are important at higher speeds, e.g., for analysis of the behavior of transonic and supersonic planes, missiles, and projectiles.

Fluid dynamics itself displays some very complex physics, such as boundary-layer flows, transition to turbulence , and turbulence dynamics, that require continued scientific research. CFD must also incorporate additional complex physics to deal with many real world problems. This may entail additional force fields, coupling to surface atomic physics and microphysics, changes in phase, changes of chemical composition, and interactions among multiple phases in heterogeneous flows. Direct Simulation Monte Carlo and plasma simulation for atmospheric re-entry, microelectro-mechanical systems (MEMS), materials processing, and magnetohydrodynamics (MHD) for advanced power systems and weapons effects are examples of processes analyses that involve additional comples physics. CFD has no restrictions on the geometry and may include motion and deformation of solid boundaries defining the flow.

The objective of the CFD-CTA is to accelerate the exploitation of scalable parallel high performance computing systems to solve computational fluid dynamics problems of critical importance to the DOD. The first phase of of the transition to high performance computing, known as the Common High Performance Software Support Initiative(CHSSI), is underway. Teams of experts in the CFD-CTA are developing a suite of multipurpose software that will meet a large percentage of the DOD's complex geometry CFD applications software needs and will perform efficiently on a range of scalable high performance computing platforms. Additionally, the scalable CFD application software will be integrated into the DOD RDT&E programs.

There are currently underway six (6) general purpose, scalable CFD software projects based on variations of the three general types of gridding methods used to represent complex flow geometry: the rectilinear structured grid, the scalable unstructured grid, and the local block structured/overset grid. DOD-led "multigeneration teams" (DOD, NCHPC, academia & industry) are developing the HPC software of integrated capabilities to meet more than half the CFD requirements of the DOD. CHSSI includes demonstration simulations for several critical DOD CFD applications.

Plans for software dissemination and technology transfer include "multi-generation" project teams to address evolving hardware & software; scientists and engineers as the primary technology transfer agents; and teams comprised of algorithm/code developers & applications.

EXPLORE THE SOFTWARE ATTRIBUTES OF THE CFD-CTA PROJECTS

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GLOBAL, RECTILINEAR, STRUCTURED GRIDDING

FAST 3D PROJECT

GLOBAL VCE
and FCT REACTIVE FLOW MODEL


LOCAL BLOCK STRUCTURED / OVERSET GRIDDING

MERCURY PROJECT

BLOCK STRUCTURED GRIDDING
and FINITE FLOW SOLVER

ZNS PROJECT

BLOCK STRUCTURED GRIDDING
and ZONAL N-S FLOW SOLVER

OVERSET PROJECT

DYNAMIC CHIMERA GRIDDING
and FLOW SOLVER


UNSTRUCTURED GRID SOFTWARE ATTRIBUTES

COBALT PROJECT

UNSTRUCTURED GRID
EULER/NAVIER STOKES FLOW SOLVER

FEFLO PROJECT

UNSTRUCTURED GRIDDING
and FINITE ELEMENT N-S FLOW SOLVER

PARTICIPATING IN THE CFD-CTA