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

传热传质问题通常由各种不同传输过程的复杂系统组成。为了得到它们的计算解，需要对各个相关过程进行求解，并将它们的解耦合到一个完整的系统中。为此，应根据传导、对流和辐射等传输过程将问题分成不同的部分，并相互交换边界条件。在本研究中，该过程的各个场由研究人员或该领域的专家独立求解，并交流边界条件的信息，使分离的解成为一个整体。每个调查者的子系统也被分解成更多的子系统，以便通过使用Transputer来加速计算。他们整合所需的计算结果通过大学之间的通信系统进行交换，Junet。需要解决的两个问题是在可传播边界条件下的离散个体计算和不同解的集成。作为问题的一个例子，研究了提拉法生长半导体晶体的过程，因为它与热质传递的基本过程是高度非线性耦合的。结果发现，交换和施加子系统的边界条件应该是整个系统集成速率控制的最重要因素。

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.