Development of a large-scale parallel and dispersed computation system of complexed heat transfer problems

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The heat and mass transfer problems usually consist of complexed systems of various different transport processes. In order to obtain computational solution of them, it is necessary to solve the individual related processes as well as to couple their solutions into an integrated system. For this purpose, it should be solved by dividing the problem into parts depending on the transport process such as conduction, convection and radiation and by exchanging the boundary conditions each other. In the present research, the individual fields of the process are solved independently by the investigators, specialists in the field, with communicating the information of the boundary conditions which make the separated solutions into an integrated one. The subsystems of each investigator are also made to be decomposed into further subsystems in order to accelerate the calculation by using the transputers. Their computed results necessary for the integration are exchanged through the communication system between universities, JUNET. Two subjects to be solved are the individual computation dispersed under the communicable boundary conditions and the integration of different solutions. As an example of the problem, the process of semiconductor crystal growth by the Czochralski method is studied because it is highly non-linearly coupled with fundamental processes of heat and mass transfer. As the results, it is found that exchanging and imposing the boundary conditions of subsystem should be the most important factor for rate-controlling of the integration of the whole system.