CAJ | 학술논문

在雷诺平均 N －S 方程湍流模型框架内，壁面函数常用来模型化壁面附近的低雷诺数流动。探讨基于标准湍流模型数值模拟大气边界层中出现的壁面函数问题。在已有标准壁面函数基础上，通过增加一个附加项来模型化地表上面建筑结构等粗糙元由于大小不一、错乱分布对地表附近空气流动产生的附加影响。通过模拟缩尺比为1∶300的具有较大空气动力学粗糙长度的中性大气边界层，以及缩尺比为1∶50的 TTU 低矮建筑模型在中性大气边界层内的绕流，对附加项的有效性和使用场合进行评估和说明。结果表明：附加项对于解决壁面函数问题，即在计算域内保持来流边界条件是必要的。
재뢰낙평균 N －S 방정단류모형광가내，벽면함수상용래모형화벽면부근적저뢰낙수류동。탐토기우표준단류모형수치모의대기변계층중출현적벽면함수문제。재이유표준벽면함수기출상，통과증가일개부가항래모형화지표상면건축결구등조조원유우대소불일、착란분포대지표부근공기류동산생적부가영향。통과모의축척비위1∶300적구유교대공기동역학조조장도적중성대기변계층，이급축척비위1∶50적 TTU 저왜건축모형재중성대기변계층내적요류，대부가항적유효성화사용장합진행평고화설명。결과표명：부가항대우해결벽면함수문제，즉재계산역내보지래류변계조건시필요적。
Wall function is preferred to model the low Reynolds-number flow near wall based on the Reynolds-averaged Navier-Stokes turbulent models.Then wall function problem in simulating the atmospheric boundary layer based on the standard turbulent model was investigated.An extra term which considers the extra effects induced by non-uniform and irregular distribution of rough elements such as various structures on the land surface was proposed and appended to the widely accepted standard wall function.The effectiveness and application situation of the proposed term were demonstrated by simulating a neutral wind field with the scale of 1:300 featured by larger aerodynamic roughness length. The flow around the TTU model in a neutral wind field with the scale of 1:50 was then simulated.The extra term is shown to be necessary to solve the wall function problem ,i.e.,the preservation inlet flow boundary conditions in computation domain in both cases.