1992 Fiscal Year Final Research Report Summary
DEVELOPMENT OF NUMERICAL ANALYSIS METHOD AND INTERNAL MECHANISM OF BREAKING WAVE ON ARBITRARY BOUNDARY SHAPE CONDITION
| Project/Area Number |
03650428
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Hydraulic engineering
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| Research Institution | KUMAMOTO UNIVERSITY |
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Principal Investigator |
TAKIKAWA Kiyoshi KUMAMOTO UNIVERSITY, CIVIL AND ENVIRONMENTAL ENGINEERING, PROFESSOR, 工学部, 教授 (80040450)
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| Project Period (FY) |
1991 – 1992
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| Keywords | BREAKING WAVE / BREAKING WAVE MECHANISM / NUMERICAL SIMULATION / FEM METHOD / SMAC METHOD / GSMAC METHOD / BREAKING WAVE FORCE / WAVE DEFORMATION |
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| Research Abstract |
THIS RESEARCH HAS TAKEN TO CLEAR THE INTERNAL MECHANISM OF BREAKING WAVE, AND TO PRESENT THE NUMERICAL MODEL OF ENERGY DISSIPATION CAUSED BY VOLTEX AND TURBULENCE IN WAVE BREAKING PROCESS, AND TO DEVELOP THE NUMERICAL ANALYSIS SYSTEM OF WAVE DEFORMATION AND BREAKING WAVE ON ARBITRARY BOUNDARY CONDITION.
1. EXPERIMENTAL RESEARCH
WE DID MANY TYPE EXPERIMENT OF BREAKING WAVE SUBJECTED TO A PROGRESSIVE WAVE ON SLOPE AND A SUBMERGED BREAKWATER, A STANDING WAVE IN FRONT OF VERTICAL WALL AND BREAKING WAVE FORCE OF A PIPE. VARIATION OF VOLTEX, TURBULENCE, REYNOLDS STRESS-STRAIN AND OTHERS WERE CALCULATED FROM EXPERIMENTAL DATAS AND THERE'S DISTRIBUTION IN TIME AND SPACE WERE INVESTIGATED. FROM THESE EXPERIMENTAL RESULTS, IT BECAME CLEAR THAT THE ENERGY DISSIPATION IN BREAKING WAVE PROCESS IS SUBJECTED TO REYNOLDS STRESS OF PRANDTL TYPE AND TIME-DEPENDENT REYNOLDS STRAIN AS TO ACCELERATION TERM.
2. THEORITICAL RESEARCH
WE APPLIED S M A C METHOD FOR MORE EXACT CALCULATION OF BREAKING WAVE PROCESS, BECAUSE THIS BREAKING WAVE PHENOMENON IS A HEAVY NONLINEAR AND UNSTEADY PROBLEM OF VISCOUS FLUID. AS A FAST CONDITION OF CALCULATION, USING F E M DEVELOPED BY AUTHOR, SIMULATION ANALYSIS OF THE BREAKING PROCESS OF WAVES WAS PERFORMED ON THE BASIS OF THE MODIFIED S M A C METHOD IN ORDER TO EXAMINE THE PHYSICAL QUANTITIES INSIDE THE BREAKING WAVES. AN NUMERICAL MODEL OF ENERGY DISSIPATION OF THE BREAKING WAVE WAS SET UP, WHICH WAS CAUSED BY RUSH OF WATER BLOCK AND TURBULENCE IN BREAKING WATER. THIS MODEL SIMULATES THE BREAKING PROCESS OF WAVES IN GOOD AGREEMENT.
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