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Volume 37, Issue 3
Displaying 1-7 of 7 articles from this issue
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1995 Volume 37 Issue 3 Pages 159-193
Published: March 30, 1995
Released on J-STAGE: March 08, 2010
JOURNAL FREE ACCESS -
Tatsuo IYOKU, Masatoshi FUTAKAWA, Masahiro ISHIHARA1995 Volume 37 Issue 3 Pages 194-201
Published: March 30, 1995
Released on J-STAGE: April 21, 2009
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Kiyonobu YAMASHITA1995 Volume 37 Issue 3 Pages 213-216
Published: March 30, 1995
Released on J-STAGE: January 07, 2010
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Ikuo IOKA, Yoshiyuki INAGAKI, Kunihiko SUZUKI, Kazuhiko KUNITOMI, Yosh ...1995 Volume 37 Issue 3 Pages 217-227
Published: March 30, 1995
Released on J-STAGE: April 21, 2009
JOURNAL FREE ACCESSAn In-core Structure Test Section (HENDEL-T2) is a full scale simulation model of the core bottom structure of High Temperature Engineering Test Reactor (HTTR). Experimental studies on cooling performance of the core bottom structure were carried out by the use of the HENDEL-T2 to verify integrity of the metal structures.
Experimental results showed that the temperature distribution of the core bottom structure was almost uniform in the circumferential direction. The temperatures of the metal structures were lower than the design temperatures. The heat transfer from the hot helium gas to the cold helium gas was negligibly small in the core bottom structure. The leakage flow of cold helium gas through the gaps of core bottom structure increased with the pressure difference between the hot and cold helium gases. However, there was no effect of the pressure difference on the temperature distribution of the core bottom structure in the circumferential direction. The detailed temperature distribution of the core bottom structure in HTTR was calculated by a three-dimensional thermal analysis code. Remarkably hot region in the core support plate could not be found in the analysis. The calculated temperatures of the metal structures for HTTR were lower than the design temperatures at the end of HTTR's life.View full abstractDownload PDF (11406K) -
Taturou YASHIKI, Genki YAGAWA, Hiroshi OKUDA1995 Volume 37 Issue 3 Pages 228-237
Published: March 30, 1995
Released on J-STAGE: March 08, 2010
JOURNAL FREE ACCESSThe adaptive finite element method based on an 'a posteriori error estimation' is known to be a powerful technique for analyzing the engineering practical problems, since it excludes the instinctive aspect of the mesh subdivision and gives high accuracy with relatively low computational cost. In the adaptive procedure, both the error estimation and the mesh generation according to the error estimator are essential. In this paper, the adaptive procedure is realized by the automatic mesh generation based on the control of node density distribution, which is decided according to the error estimator. The global percentage error, CPU time, the degrees of freedom and the accuracy of the solution of the adaptive procedure are compared with those of the conventional method using regular meshes. Such numerical examples as the driven cavity flows of various Reynolds numbers and the flows around a cylinder have shown the very high performance of the proposed adaptive procedure.View full abstractDownload PDF (11383K) -
Yukihisa YABUSHITA, Yoshihiro TANAMACHI, Yoshinori SHIMODA, Nobuo SHIM ...1995 Volume 37 Issue 3 Pages 238-249
Published: March 30, 1995
Released on J-STAGE: January 07, 2010
JOURNAL FREE ACCESSThis paper presents the contribution of the second-order spatial differential terms to the well-posedness of two-fluid model, assuming that one pressure is set for each cell in a one-dimensional two-phase flow system. According to the results of the numerical calculation by applying Hadamard condition, second-order spatial differential term makes the given equation system well-posed as the initial value problem in case the momentum equation is endowed with second-order spatial differential term.
Such a condition cannot be always applied to judge the well-posedness if the equation system is hyperbolic and coefficient matrix of the differential term with respect to time is singular, the determinant of the matrix is zero.
As described in this paper, with regard to a differential equation system whose differential terms, including second-order spatial differential terms, are converted into first or zero-order terms, it is necessary for the characteristic equation not to be eliminated zero-order term to evaluate the well-posedness by examining the bounded of real part of the characteristic root.View full abstractDownload PDF (4664K) -
1995 Volume 37 Issue 3 Pages 253
Published: 1995
Released on J-STAGE: April 21, 2009
JOURNAL FREE ACCESSDownload PDF (48K)
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