壁面边界层附近高温圆柱绕流的直接数值模拟
Direct Numerical Simulation of Flow Around a High-Temperature Cylinder Near a Wall Boundary Layer
王凯越 1王海鸥 1罗坤 1樊建人1
作者信息
- 1. 浙江大学能源清洁利用国家重点实验室,杭州 310027
- 折叠
摘要
本文使用直接数值模拟对等温和非等温条件下壁面附近的二维圆柱绕流进了研究.在层流条件下,讨论了间隙比G/D(G为圆柱下表面和壁面的距离,D为圆柱直径)以及传热对圆柱周围流场和圆柱受力的影响.当G/D=0.5时,圆柱下表面的涡脱落会受到壁面边界层抑制,在壁上形成一个较大的回流区.当G/D=1.0时,壁面回流区减小,圆柱下表面出现了涡脱落.当G/D=3.0时,流动与无壁面约束条件下的圆柱绕流相似.当圆柱温度高于流体温度时,平均升力系数减小,而曳力的振荡幅度有所增加.
Abstract
This study employs direct numerical simulation to investigate the two-dimensional flow around a cylinder near a wall under both isothermal and non-isothermal conditions.Under laminar flow conditions,the effects of gap ratio G/D(where G is the distance between the cylinder's lower surface and the wall,and D is the cylinder diameter)and heat transfer on the flow field around the cylinder and the forces exerted on the cylinder are discussed.For G/D=0.5,the vortex shedding from the cylinder's lower surface is suppressed by the wall boundary layer,forming a larger recirculation zone on the wall.For G/D=1.0,the recirculation zone on the wall decreases,and vortex shedding occurs from the cylinder's lower surface.For G/D=3.0,the flow is similar to that around a cylinder without wall confinement.When the cylinder's temperature is higher than the fluid's temperature,the average lift coefficient decreases,while the amplitude of drag oscillation increases.
关键词
圆柱绕流/边界层/涡脱落/曳力/传热Key words
cylinder flow/boundary layer/vortex shedding/drag force/heat transfer引用本文复制引用
基金项目
国家自然科学基金(51836007)
国家自然科学基金(52022091)
中央高校基本科研业务费专项(2021FZZX001-10)
出版年
2024
NETL
NSTL
万方数据