Impact of fracture network geometry on free convective flow patterns
Impact of fracture network geometry on free convective flow patterns
复制标题
裂缝网络几何形状对自由对流流动模式的影响
DOI:
10.1016/j.advwatres.2014.06.001
复制
发表时间:
2014
影响因子:
4.7
通讯作者:
Werner A.D.
中科院分区:
文献类型:
--
作者:
Vujevic´ K;Graf T;Simmons C.T;Werner A.D.
The effect of fracture network geometry on free convection in fractured rock is studied using numerical simulations. We examine the structural properties of fracture networks that control the onset and strength of free convection and the patterns of density-dependent flow. Applicability of the equivalent porous medium approach (EPM) is also tested, and recommendations are given, for which situations the EPM approach is valid. To date, the structural properties of fracture networks that determine free convective flow are examined only in few, predominantly simplified regular fracture networks. We consider fracture networks containing continuous, discontinuous, orthogonal and/or inclined discrete fractures embedded in a low-permeability rock matrix. The results indicate that bulk permeability is not adequate to infer the occurrence and magnitude of free convection in fractured rock. Fracture networks can inhibit or promote convection depending on the fracture network geometry. Continuous fracture circuits are the crucial geometrical feature of fracture networks, because large continuous fracture circuits with a large vertical extent promote convection. The likelihood of continuous fracture circuits and thus of free convection increases with increasing fracture density and fracture length, but individual fracture locations may result in great deviances in strength of convection between statistically equivalent fracture networks such that prediction remains subject to large uncertainty.
登录
查看更多内容
影响因子:
4.7
作者:
T. Graf;R. Therrien
通讯作者:
R. Therrien
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
R. Mckibbin;P. Tyvand
通讯作者:
P. Tyvand
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
D. Weatherill;C. Simmons;C. Voss;N. Robinson
通讯作者:
N. Robinson
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
K. Johannsen
通讯作者:
K. Johannsen
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
T. Graf
通讯作者:
T. Graf