Process control of largescale finite element simulation software
Abstract
We have developed a methodology for coupling largescale numerical codes with process control algorithms. Closedloop simulations were demonstrated using the Sandiadeveloped finite element thermal code TACO and the commercially available finite element thermalmechanical code ABAQUS. This new capability enables us to use computational simulations for designing and prototyping advanced processcontrol systems. By testing control algorithms on simulators before building and testing hardware, enormous time and cost savings can be realized. The need for a closedloop simulation capability was demonstrated in a detailed design study of a rapidthermalprocessing reactor under development by CVC Products Inc. Using a thermal model of the RTP system as a surrogate for the actual hardware, we were able to generate response data needed for controller design. We then evaluated the performance of both the controller design and the hardware design by using the controller to drive the finite element model. The controlled simulations provided data on wafer temperature uniformity as a function of ramp rate, temperature sensor locations, and controller gain. This information, which is critical to reactor design, cannot be obtained from typical openloop simulations.
 Authors:
 Publication Date:
 Research Org.:
 Sandia National Labs., Livermore, CA (United States)
 Sponsoring Org.:
 USDOE, Washington, DC (United States)
 OSTI Identifier:
 205962
 Report Number(s):
 SAND968214
ON: DE96006553
 DOE Contract Number:
 AC0494AL85000
 Resource Type:
 Technical Report
 Resource Relation:
 Other Information: PBD: Feb 1996
 Country of Publication:
 United States
 Language:
 English
 Subject:
 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; COMPUTERAIDED MANUFACTURING; MACHINERY; SERVOMECHANISMS; THERMOCHEMICAL PROCESSES; EQUATIONS; COMPUTER CODES
Citation Formats
Spence, P.A., Weingarten, L.I., Schroder, K., Tung, D.M., and Sheaffer, D.A.. Process control of largescale finite element simulation software. United States: N. p., 1996.
Web. doi:10.2172/205962.
Spence, P.A., Weingarten, L.I., Schroder, K., Tung, D.M., & Sheaffer, D.A.. Process control of largescale finite element simulation software. United States. doi:10.2172/205962.
Spence, P.A., Weingarten, L.I., Schroder, K., Tung, D.M., and Sheaffer, D.A.. 1996.
"Process control of largescale finite element simulation software". United States.
doi:10.2172/205962. https://www.osti.gov/servlets/purl/205962.
@article{osti_205962,
title = {Process control of largescale finite element simulation software},
author = {Spence, P.A. and Weingarten, L.I. and Schroder, K. and Tung, D.M. and Sheaffer, D.A.},
abstractNote = {We have developed a methodology for coupling largescale numerical codes with process control algorithms. Closedloop simulations were demonstrated using the Sandiadeveloped finite element thermal code TACO and the commercially available finite element thermalmechanical code ABAQUS. This new capability enables us to use computational simulations for designing and prototyping advanced processcontrol systems. By testing control algorithms on simulators before building and testing hardware, enormous time and cost savings can be realized. The need for a closedloop simulation capability was demonstrated in a detailed design study of a rapidthermalprocessing reactor under development by CVC Products Inc. Using a thermal model of the RTP system as a surrogate for the actual hardware, we were able to generate response data needed for controller design. We then evaluated the performance of both the controller design and the hardware design by using the controller to drive the finite element model. The controlled simulations provided data on wafer temperature uniformity as a function of ramp rate, temperature sensor locations, and controller gain. This information, which is critical to reactor design, cannot be obtained from typical openloop simulations.},
doi = {10.2172/205962},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month = 2
}

In this report we present parallel solvers for large linear systems arising from the finiteelement discretization of the threedimensional steadystate groundwater flow problem. Our solvers are based on multigrid and Krylov subspace methods. The parallel implementation is based on a domain decomposition strategy with explicit message passing using NX and MPI libraries. We have tested our parallel implementations on the Intel Paragon XP/S 150 supercomputer using up to 1024 parallel processors and on other parallel platforms such as SGI/Power Challenge Array, Cray/SGI Origin 2000, Convex Exemplar SPP1200, and IBM SP using up to 64 processors. We show that multigrid canmore »

Partitionofunity finiteelement method for large scale quantum molecular dynamics on massively parallel computational platforms
Over the course of the past two decades, quantum mechanical calculations have emerged as a key component of modern materials research. However, the solution of the required quantum mechanical equations is a formidable task and this has severely limited the range of materials systems which can be investigated by such accurate, quantum mechanical means. The current state of the art for largescale quantum simulations is the planewave (PW) method, as implemented in now ubiquitous VASP, ABINIT, and QBox codes, among many others. However, since the PW method uses a global Fourier basis, with strictly uniform resolution at all points inmore » 
Finite element simulation of moisture movement and solute transport in a large caisson
The results of the solute transport experiments performed on compacted, crushed Bandelier Tuff in caisson B of the experimental cluster described by DePoorter (1981) are simulated. Both one and threedimensional simulations of solute transport have been performed using two selected finite element codes. Results of bromide and iodide tracer experiments conducted during nearsteady flow conditions have been analyzed for pulse additions made on December 6, 1984, and followed over a period of up to 60 days. In addition, a pulse addition of nonconservative strontium tracer on September 28, 1984, during questionably steady flow conditions has been analyzed over a periodmore » 
Fullscale laboratory simulation facility to test particulate and organic emissions from a Third World residential combustion process. III. Evaluation of a potential technique for the control of emissions from the indoor, openhearth combustion of coal. Rept. for Jul 91Feb 92
The paper reports controlled fullscale laboratory studies designed to determine if clay addition holds promise as a technique to control emissions from higher grade coals. (NOTE: Abnormally high rates of lung cancer are observed among persons in Xuan Wei County, China, who burn bituminous 'smoky' coal as compared with those who burn 'smokeless' coal, which is produced by mixing low grade coals with clay.) Statistically significant reductions in emissions of total particulate (70%), gravimetrically determined (nonvolatile) organics (70%), total chromatographable (semivolatile) organics (90%), and benzo(a)pyrene (65%) were observed (measured on a mass emitted/mass coal combusted basis) when clay binder materialmore » 
Study of the stateoftheart of instrumentation for process control and safety in largescale coal gasification, liquefaction, and fluidizedbed combustion systems. [42 references]
A study has been carried out to determine the stateoftheart of instrumentation which is available for process control and safety in planned demonstration and commercial scale coal gasification, liquefaction, and fluidizedbed combustion systems. The study identified available instrumentation which will perform satisfactorily in these systems and pinpointed deficiencies for which instruments must be developed. The identified deficiencies fall into the same few categories for all processes considered. These categories are presented with associated physical parameters found in the various processes studied. Development of instruments to meet these deficiencies is recommended along with development of control valves and optimal control schemesmore »