Numerical model output data on the interaction of flow with a permeable bed and biofilms

The data contains numerical model simulations designed to assess the influence of a) a permeable bed on flow structures above and within the pore spaces of a bed and b) a biofilm streamer on the free flow structure. For the former the data relates to a novel Computational Fluid Dynamics (CFD) model that is able to simulate flow both in the boundary layer flow and Brinkman layer. This allows simultaneous predictions of surface and subsurface flow in one numerical scheme. The analysis is applied to undertake a numerical sensitivity experiment to assess how bed permeability influences flow over bed forms typically found in river channels e.g. dunes. For the latter the data simulates flow around biofilm-streamers in the laminar flow regime. Numerical simulations simulate the flapping motion of a single biofilm streamer. The major thrust of the study is to investigate the impact of changing Reynolds number on hydrodynamic characteristics of the ambient flow and the frequency of biofilm oscillation.

本数据集包含数值模型模拟结果，旨在评估两类因素的影响效应：a) 透水床层对床面上方及床层孔隙内部流动结构的影响；b) 生物膜丝（biofilm streamer）对自由流动结构的影响。针对前者，本数据集关联一款新型计算流体动力学（Computational Fluid Dynamics, CFD）模型，该模型可同时模拟边界层流动与布林克曼层（Brinkman layer）内的流动，从而在单一数值求解框架下实现床面流动与地下孔隙流动的同步预测。本研究通过该模型开展数值敏感性试验，量化分析床层渗透率对典型河道河床形态（如沙丘）上方流动的调控作用。针对后者，本数据集模拟层流流态下生物膜丝周围的流动，数值仿真聚焦于单根生物膜丝的拍动运动。本研究的核心内容为探究雷诺数（Reynolds number）变化对来流水动力特性以及生物膜振荡频率的影响。