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Evaluation Techniques and Properties of an Exact Solution to a Subsonic Free Surface Jet Flow

Description: Computational techniques for the evaluation of steady plane subsonic flows represented by Chaplygin series in the hodograph plane are presented. These techniques are utilized to examine the properties of the free surface wall jet solution. This solution is a prototype for the shaped charge jet, a problem which is particularly difficult to compute properly using general purpose finite element or finite difference continuum mechanics codes. The shaped charge jet is a classic validation problem fo… more
Date: April 1, 2002
Creator: ROBINSON, ALLEN C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Best Approximation Evaluation of a Finite Element Calculation

Description: We discuss an electrostatics problem whose solution must lie in the set S of all real n-by-n symmetric matrices with all row sums equal to zero. With respect to the Frobenius norm, we provide an algorithm that finds the member of S which is closest to any given n-by-n matrix, and determines the distance between the two. This algorithm makes it practical to find the distances to S of finite element approximate solutions of the electrostatics problem, and to reject those which are not sufficientl… more
Date: September 29, 1999
Creator: ROBINSON, ALLEN C. & ROBINSON, DONALD W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Periodic Boundary Conditions in the ALEGRA Finite Element Code

Description: This document describes the implementation of periodic boundary conditions in the ALEGRA finite element code. ALEGRA is an arbitrary Lagrangian-Eulerian multi-physics code with both explicit and implicit numerical algorithms. The periodic boundary implementation requires a consistent set of boundary input sets which are used to describe virtual periodic regions. The implementation is noninvasive to the majority of the ALEGRA coding and is based on the distributed memory parallel framework in AL… more
Date: November 1, 1999
Creator: AIDUN,JOHN B.; ROBINSON,ALLEN C. & WEATHERBY,JOE R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ALEGRA: User Input and Physics Descriptions Version 4.2

Description: ALEGRA is an arbitrary Lagrangian-Eulerian finite element code that emphasizes large distortion and shock propagation. This document describes the user input language for the code.
Date: October 1, 2002
Creator: BOUCHERON, EDWARD A.; BROWN, KEVIN H.; BUDGE, KENT G.; BURNS, SHAWN P.; CARROLL, DANIEL E.; CARROLL, SUSAN et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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