Mass conservation for instantaneous sources in FEM3 simulations of material dispersion

Technical Report · Sun Nov 01 00:00:00 EST 1987

DOI:https://doi.org/10.2172/5662010· OSTI ID:5662010

Rodean, H C

This report presents the results of a systematic study in which it is shown that the numerical integration errors in determining material mass content are negligible; the material phase-change model by itself is not a cause of material mass variation; and a linear relation between fractional mass change and fractional density change at the source center for given mesh and source geometries exists over a range of values from 10/sup -5/ to 10/sup -1/. This suggests that the omission of the par. delta rho/par. deltat term from the mass conservation equation is the cause of the observed non-conservation of mass by FEM3. It is shown that these mass variations can be minimized by minimizing the initial density gradients in the source region. 5 refs., 18 figs., 4 tabs.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5662010
• Report Number(s): UCID-21266; ON: DE88004065; TRN: 88-004040
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
MASS
DISPERSIONS
MASS DISTRIBUTION
COMPUTERIZED SIMULATION
CONSERVATION LAWS
DENSITY
F CODES
MIXTURES
PHASE SPACE
PHASE TRANSFORMATIONS
TEMPERATURE DEPENDENCE
TWO-PHASE FLOW
COMPUTER CODES
DISTRIBUTION
FLUID FLOW
MATHEMATICAL SPACE
PHYSICAL PROPERTIES
SIMULATION
SPACE
SPATIAL DISTRIBUTION
640410* - Fluid Physics- General Fluid Dynamics