報告書番号

E284004

タイトル（和文）

A NUMERICAL MODEL FOR PREDICTION OF AIR FLOWAND DIFFUSION OVER A HILLY TERRAIN QUASI-POTENTIAL FLOW MODEL CONSIDERING VISCOUS EFFECTS-

タイトル（英文）

A NUMERICAL MODEL FOR PREDICTION OF AIR FLOWAND DIFFUSION OVER A HILLY TERRAIN QUASI-POTENTIAL FLOW MODEL CONSIDERING VISCOUS EFFECTS-

概要 （図表や脚注は「報告書全文」に掲載しております）

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概要 （英文）

IN PREVIOUS REPORT,A POTENTIAL FLOW MODEL WAS DEVELOPED TO PREDICT WIND FIELDS IN COMPLEX TERRAIN. IN THE POTENTIALFLOW MODEL,WIND VECTORS AND AIR FLOWS ARE ESTIMATED FROM A VELOCITY POTENTIAL FUNCTION OBTAINED BY COMBINING TWO OR THREE-DIMENSIONAL DOUBLETS AND A UNIFORM STREAM. IN THIS REPORT,WE EXAMINED THE POTENTIAL FLOW MODEL FOR ITS VALIDITY. THE WIND DIRECTIONS CALCULATED BY THE POTENTIAL FLOW MODEL ARE COMPARED WITH THE RESULTS OF FIELD EXPERIMENTS IN PRESENCE OF DOUBLE GAUSSIAN FORM MODELS. THE OVERALL AGREEMENT OF THE CALCULATED WIND DIRECTIONS WITH THE EXPERIMENTAL MEASUREMENTS IS GOOD. THE WIND PROFILES CALCULATED BY THE POTENTIAL FLOW MODEL ARE COMPARED WITH THREE DIFFERENT EXPERIMENTS; WIND TUNNEL EXPERIMENT IN PRESENCE OF A TWO-DIMENSIONAL TRIANGULAR HILL,FIELD EXPERIMENT IN PRESENCE OF DOUBLE GAUSSIAN FORM MODELS,AND FIELD EXPERIMENT IN PRESENCE OF A REAL TERRAIN FORMMODEL. THE POTENTIAL FLOW MODEL OVERESTIMATES THE WIND VELOCITIES NEARGROUND,BECAUSE THE POTENTIAL FLOW CANNOT PROVIDE VISCOUS EFFECTS. TO INTRODUCE VISCOUS EFFECTS, THE DEFINITION OF THE VELOCITY POTENTIAL IS MODIFIED TO INCLUDE HEIGHT-DEPENDENT COEFFICIENT DETERMINED BY AN INFLOWVELOCITY PROFILE. THE WIND PROFILES CALCULATED BY THE REVISED MODEL ARE IN MUCH BETTER AGREEMENT WITH MEASUREMENTS.

報告者

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