Abstract Fluid forces and torques in a random stationary suspension of oblate cylinder-like particles of AR0.25 are investigated in the Reynolds number range 10 ≤ Re ≤ 300 and solid fraction range 0.1 ≤ φ ≤ 0.3 using Particle Resolved Simulations with the Immersed Boundary Method (IBM). While existing correlations were found to grossly under predict the drag forces, a sinusoidal function F d , θ = F d , θ = 0 ∘ + ( F d , θ = 90 ∘ − F d , θ = 0 ∘ ) sin ( θ ) captured the variation of normalized drag with respect to inclination angle over the range 10 ≤ Re ≤ 300 and 0 ≤ φ ≤ 0.3. Further the mean ensemble drag followed F d = F d , θ = 0 ∘ + 1 2 ( F d , θ = 90 ∘ − F d , θ = 0 ∘ ) . Lift forces varied between 20% and 80% of drag forces over the range of Reynolds numbers studied. Comparing the pitching fluid torque to collision torque in an elastic collision showed that as the particle equivalent diameter, density, and collision velocity decrease, fluid torque can be of the same order of magnitude as collisional torque and cannot be neglected.

中文翻译：

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纵横比为 1:4 的扁圆柱体悬架中的流体力和扭矩

摘要 在雷诺数范围 10 ≤ Re ≤ 300 和固体分数范围 0.1 ≤ φ ≤ 0.3 内，使用浸入边界法的粒子分辨模拟研究了 AR0.25 扁圆柱状颗粒随机静止悬浮液中的流体力和扭矩(IBM)。虽然发现现有的相关性严重低估了阻力，但正弦函数 F d , θ = F d , θ = 0 ∘ + ( F d , θ = 90 ∘ − F d , θ = 0 ∘ ) sin ( θ )在 10 ≤ Re ≤ 300 和 0 ≤ φ ≤ 0.3 的范围内，捕获了归一化阻力相对于倾角的变化。此外，平均整体阻力遵循 F d = F d , θ = 0 ∘ + 1 2 ( F d , θ = 90 ∘ − F d , θ = 0 ∘ ) 。在所研究的雷诺数范围内，升力在阻力的 20% 到 80% 之间变化。