CAJ | 학술논문

根据蠕动流方程和Navier-Stokes方程，建立了单裂隙微凸体粗糙裂隙几何物理模型，并采用有限元方法对单裂隙微凸体粗糙裂隙及真实地层裂隙进行仿真模拟，研究了流体在通过上述裂隙时流速场分布及流速特性。规定了两个描述粗糙程度的参数：粗糙相关度R0＝2A/bmin ，粗糙倾斜指数R1＝2A/λ。分析表明，单裂隙壁面处流体不参与流动，粘滞力影响较大；粗糙裂隙流场沿壁面成扇形分布，会产生“回流”现象。微凸体高度及密度可表征裂隙表面粗糙程度，微凸体高度与流体压差呈负相关，微凸体密度与流体压差呈正相关， R0和R1都与雷诺数及流量成反比关系，R1的临界值为0．714。
근거연동류방정화Navier-Stokes방정，건립료단렬극미철체조조렬극궤하물리모형，병채용유한원방법대단렬극미철체조조렬극급진실지층렬극진행방진모의，연구료류체재통과상술렬극시류속장분포급류속특성。규정료량개묘술조조정도적삼수：조조상관도R0＝2A/bmin ，조조경사지수R1＝2A/λ。분석표명，단렬극벽면처류체불삼여류동，점체력영향교대；조조렬극류장연벽면성선형분포，회산생“회류”현상。미철체고도급밀도가표정렬극표면조조정도，미철체고도여류체압차정부상관，미철체밀도여류체압차정정상관， R0화R1도여뢰낙수급류량성반비관계，R1적림계치위0．714。
According to the creeping flow equation and Navier -Stokes equation , the paper set up single asperity rough fracture geometry physical model and simulated the seepage behavior of single asperity rough fracture and true formation fracture by using finite element method ( FEM ) .It also comparatively analyzed the fluid flow characteristics and flow field distribution in the fracture .The paper defined two parameters of roughness that the coarse correlation R0 equals to 2A/b min , inclined rough index R1 equals to 2A/λ.The analysis showed that the single fracture walls don't participate in fluid flow and viscous force has great influence;the rough fracture fluid forms a fan-shaped distribution along the wall and may pro-duce the phenomenon of “backflow”.The asperity height and density can be used to describe fracture surface roughness .The asperity height and fluid pressure difference showed a negative correlation , while the relation of asperity density and fluid pressure is positive .R0 and R1 are inversely proportional to the Reynolds number and flow rate .The critical value of R1 is 0.714.