Integration of CAD/CFD Workshop

The fields of computer aided design (CAD) and computational fluid dynamics (CFD) have advanced dramatically in recent years, in terms of theory, algorithms, commercial software, and widespread adoption in engineering practice. The developments in these fields, however, have been largely independent of each other, and the lack of synergy between them has caused the use of CAD models in CFD simulation (and, conversely, the conversion of CFD data into CAD models) to be rather cumbersome and error-prone processes.

CAD systems facilitate the description of complex surface geometries, and CFD is often concerned with producing optimum flow characteristics over such geometries (turbine blades, aircraft wings, ship hulls, etc.) Nevertheless, precise CAD geometry is usually discretized to permit the flow analysis, and changes to the geometry (e.g., to improve lift/drag ratio) suggested by the analysis are communicated to the CAD system in discrete form and must be "smoothed out" there. CFD algorithms can be sensitive to the quality of geometrical boundary discretizations, and may require higher-order (spline) interpretations of such discrete data for stability and rapid convergence. Traditional CAD methods, such as the use of B-splines, are beginning to find acceptance (e.g., as shape = functions) in the mainstream CFD community.

The purpose of this workshop is to stimulate discussion and promote interaction between the CAD and CFD communities, by bringing together small groups of leading researchers in these fields. The format will be such as to encourage in-depth exploration of important problems, current needs, and promising areas for collaborations in the CAD/CFD interface, rather than presentation of polished results in each field. The anticipated outcomes of the workshop include: (1) imparting to each field a clear idea of the current state-of-the-art in the other; (2) identifying important problems of mutual interest to the two fields, whose solution will offer a significant impact on the efficiency and reliability of their interaction; (3) promotion of interdisciplinary research projects between groups of attendees on problems that appear to be ripe for solution; and (4) compilation and publication of the findings of the workshop -- in, for example, the SIAM News.

Funding

This workshop is sponsored by SIAM and the University of California, Davis with the support of the National Science Foundation.

Final Program

8:30 AM-9:10 AM POSITION PAPER 1
"On the Use of CAD-Native Predicates and Geometry in Surface Meshing"
M.J. Aftosmis, NASA Ames Research Center

9:10 AM-9:30 AM TECHNICAL PAPER 1
"Uniform Vendor-Neutral CAD Geometry/Topology Access through CAPRI"
R. Haimes, MIT

9:30 AM-9:50 AM TECHNICAL PAPER 2
"On the Search for a Valid Normal to a Surface Discretized using Triangular Elements"
J.J. Chattot, UC Davis

10:40 AM-11:20 AM POSITION PAPER 2
"Integration of CAD and CFD by Analytic and Parametric Geometry Tools"
H. Sobieczky, Deutsches Zentrum fuer Luft- und Raumfahrt

11:20 AM-11:40 AM TECHNICAL PAPER 3
"Subdivision Schemes for Two and Three Dimensional Flows"
H. Weimer and J. Warren, Rice University

11:40 AM-12:00 PM TECHNICAL PAPER 4
"Intrinsic Equations of Motion and Flow Simulations"
M. Hafez, UC Davis

1:30 PM-2:10 PM POSITION PAPER 3
"Geometry Description and Discretization: An Impediment to Achieving Engineering Goals?"
D.P. Young, D.R. Ferguson, and W. Capron, The Boeing Company

2:10 PM-2:30 PM TECHNICAL PAPER 5
"Parametric Discrete Minimax Approximation"
G. Silverman (Perfit Corp.) and L. Lasdon (UT Austin)

3:30 PM-4:10 PM POSITION PAPER 4
"Automatic Shape Optimization for Functional Requirements"
M.I.G. Bloor and M.J. Wilson, University of Leeds

4:10 PM-4:30 PM TECHNICAL PAPER 6
"An Approach in Integrating CAD to CFD/CSD: Gradient Adaptive Transfinite Elements (GATE) Family"
N. Sarigul-Klijn, J. Kim, R. Hunt, and J. Dummer, UC Davis

8:30 AM-9:10 AM POSITION PAPER 5
"Problems in CAD and CFD Integration for Commercial Applications"
S.D. Gilmore, Fluent, Inc.

9:10 AM-9:30 AM TECHNICAL PAPER 7
"Mesh and Surface Hierarchies"
J. Peters, University of Florida

9:30 AM-9:50 AM TECHNICAL PAPER 8
"Computational Line Geometry and Grid Generation"
B. Ravani, UC Davis

10:40 AM-11:20 AM POSITION PAPER 6
"Geometry Modelling Issues for Unstructured Grid CFD"
K. Morgan, N.P. Weatherill, O. Hassan, University of Wales, Swansea and E. van der Weide, L. Fornasier, and H. Rieger, Daimler Chrysler Aerospace AG, Munich

11:20 AM-11:40 AM TECHNICAL PAPER 9
"Simulation of Vortex Breakdown in Jets"
W. Kollmann, UC Davis

11:40 AM-12:00 PM TECHNICAL PAPER 10
"A New Boundary Condition Capturing Method for Elliptic Interface Problems"
X-D. Liu (UCSB), R.P. Fedkiw (UCLA/CalTech), M. Kang (UCLA), T. Sideris (UCSB)

1:30 PM-2:10 PM POSITION PAPER 7
"CAD and CFD Integration for Vehicle Aerodynamic Development"
W.S. Pien and R.H. Visintainer, Ford Motor Company

2:10 PM-2:30 PM TECHNICAL PAPER 11
"GGLiB: Geometry & Grid Library for CFD and MDAO Applications"
R. Koomullil and B.K. Soni, Mississippi State University

3:30 PM-4:10 PM POSITION PAPER 8
"Unstructured Grid Generation and CAD Geometry Model Coupling in CFD Applications" D.F. Marcum, Mississippi State University

4:10 PM-4:30 PM TECHNICAL PAPER 12
"Development of Structured Grids in Unstructured Porous Media"
H.A. Dwyer, UC Davis

4:30 PM-4:50 PM TECHNICAL PAPER 13
"Three-Dimensional, Parallel, Hybrid Grid Generation for the ASCI Program"
H.E. Trease, Los Alamos National Laboratory and J. Jones-Oliveira & J. Oliveira, Pacific Northwest National Laboratory

Hotel Information

Hallmark Inn
110 F. Street
Davis, California 95616
Phone: 530-753-3600
Fax: 530-758-8623

The sleeping room rate is $75.00 per night plus 10% tax. The room block is from April 11 through April 14, 1999. Attendees are responsible for making their own hotel reservations. Please contact Dianne Wingate, Sales Manager or fax or mail the Hotel Reservation Form.

Directions to Davis from Sacramento & San Francisco:

Take I-5 south toward Sacramento. Take the San Francisco I-80 exit and travel west for about 15 miles. In Davis, take the Richards Boulevard exit, and continue to the right under the railroad overpass. Make a right onto First Street. The Hallmark Hotel is situated immediately on your left, at the corner of First Street and F Street.

From the airport take US 101 north toward toward I-280/San Francisco/San Bruno. From US 101, join I-80 toward Bay Bridge/Oakland. Remain on I-80 east all the way to Davis (about 70 miles). Take the Richards Boulevard exit in Davis and make a right at the end of the exit ramp. After passing under the railroad overpass, make a right onto First Street. The Hallmark Hotel is situated immediately on your left, at the corner of First Street and F Street.

You can also catch a shuttle bus (Davis Airporter, 800-565-5153) from Sacramento International Airport to Davis. Ask the driver to drop you off at the Hallmark Hotel.

Maps of the UC Davis campus will be available at the Hallmark Hotel check-in desk.

Registration Information

Registration Fees

	Attendee	Student Attendee
Preregistration (before March 19)	$25	$5
Registration (after March 19)	$50	$10

Registration fee includes:

How to Register

Complete the Preregistration Form and return with your payment to SIAM. You can register by any of the following methods:

Cancellation Policy

Before April 1
After April 1

Full Refund
No Refund

Credit Cards

SIAM accepts Visa, Master Card, and American Express. Please indicate credit card type, account number, and the expiration date on the Preregistration Form.

SIAM Workshop on
Integration of CAD/CFD

April 12-13, 1999
University of California, Davis

Contents

Funding

Final Program

Hotel Information

Directions to Davis from Sacramento & San Francisco:

Registration Information

Registration Fees

Registration fee includes:

How to Register

Cancellation Policy

Credit Cards

SIAM Workshop on Integration of CAD/CFD

April 12-13, 1999 University of California, Davis

Contents

Funding

Final Program

Hotel Information

Directions to Davis from Sacramento & San Francisco:

Registration Information

Registration Fees

Registration fee includes:

How to Register

Cancellation Policy

Credit Cards

SIAM Workshop on
Integration of CAD/CFD

April 12-13, 1999
University of California, Davis