A free-Lagrange method for 2-D compressible flows

Conference · Sat Aug 01 00:00:00 EDT 1987

OSTI ID:5982335

Crowley, W P

Numerical algorithms for solving fluid flow problems are traditionally constructed in either an Eulerian or a Lagrangian reference frame. In the Lagrangian formulation, the mesh follows the fluid motion and this automatically guarantees the accurate treatment of interfaces. However, when large relative motions occur in the flow, the mesh becomes tangled and the problem must be ''repaired'' before it can continue. The Free-Lagrange method overcomes this difficulty by automatically reconnecting the mesh when necessary during run time. The main advantage of the Free-Lagrange formulation is that problems complete in a minimum amount of calendar time with an accurate solution. Another advantage is that the general mesh structure permits a great deal of flexibility in generating the initial mesh. The disadvantage is that solutions may be more expensive in terms of CPU time because the general structure of the mesh means that gather/scatter parts of the code are not vectorized. Recent hardware developments help ameliorate this consideration.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5982335
• Report Number(s): UCRL-97323; CONF-8704168-4; ON: DE88000216
• Resource Relation: Conference: Workshop on particle methods in fluid dynamics and plasma physics, Los Alamos, NM, USA, 13 Apr 1987; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
COMPRESSIBLE FLOW
FLOW MODELS
LAGRANGIAN FUNCTION
MESH GENERATION
ALGORITHMS
DISTURBANCES
INTERFACES
TWO-DIMENSIONAL CALCULATIONS
FLUID FLOW
FUNCTIONS
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
420400* - Engineering- Heat Transfer & Fluid Flow
990230 - Mathematics & Mathematical Models- (1987-1989)