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Problem Solving Environment for Parallel Adaptive Computation
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0003-2830-0454
KTH, Superseded Departments, Mechanics.
KTH, Superseded Departments, Mechanics.ORCID iD: 0000-0003-3336-1462
2004 (English)In: Mathematics and Computers in Simulation, ISSN 0378-4754, E-ISSN 1872-7166Article in journal (Other academic) Submitted
Place, publisher, year, edition, pages
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-13106OAI: diva2:320864

QCR 20160722

Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2016-07-22Bibliographically approved
In thesis
1. Melt convection in welding and crystal growth
Open this publication in new window or tab >>Melt convection in welding and crystal growth
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

A parallel finite element code with adaptive meshing was developed and used to study three dimensional, time-dependent fluid flows caused by thermocapillary convection as well as temperature and dopant distribution in fusion welding and floating zone crystal growth.

A comprehensive numerical model of the three dimensional time-dependent fluid flows in a weld pool had been developed. This model considered most of the physical mechanisms involved in gas tungsten arc welding. The model helped obtaining the actual chaotic time-dependent melt flow. It was found that the fluid flow in the weld pool was highly complex and influenced the weld pool’s depth and width. The physicochemical model had also been studied and applied numerically in order to simulate the surfactant adsorption onto the surface effect to the surface tension of the metal liquid in a weld pool.

Another model, a three dimensional time-dependent, with adaptive mesh refinement and coarsening was applied for simulating the effect of weak flow on the radial segregation in floating zone crystal growth. The phase change equation was also included in this model in order to simulate the real interface shape of floating zone.

In the new parallel code, a scheme that keeps the level of node and face instead of the complete history of refinements was utilized to facilitate derefinement. The information was now local and the exchange of information between each and every processor during the derefinement process was minimized. This scheme helped to improve the efficiency of the parallel adaptive solver.

Place, publisher, year, edition, pages
Stockholm: KTH, 2004. 36 p.
Trita-MEK, ISSN 0348-467X ; 2004:15
Engineering physics, thermocapillary convection, gas-tungsten arc welding, floating zone, parallel computing, finite element method, Teknisk fysik
National Category
Other Engineering and Technologies
urn:nbn:se:kth:diva-83 (URN)
Public defence
2004-12-15, kollegiesalen, Valhallavägen 79, Stockholm, 10:15 (English)
QC 20100527Available from: 2004-12-15 Created: 2004-12-15 Last updated: 2010-05-27Bibliographically approved

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