Dataset for "Quantifying the effects of bed roughness on transit time distributions via direct numerical simulations of turbulent hyporheic exchange"

<p>This dataset contains the sediment models, DNS flow field data, subsurface path data, and calculated transit time distributions for both the regular- and random-interface cases used in the paper: &quot;Quantifying the effects of bed roughness on transit time distributions via direct numerical simulations of turbulent hyporheic exchange&quot; by Guangchen Shen, Junlin Yuan, and Mantha S. Phanikumar (Submitted to Water Resources Research).&nbsp;<br> Detailed introduction of each data file is as follows.</p> <p>1. DNS flow field data</p> <p>Flowfield_Reg.h5 and Flowfield_Ran.h5 contains the following fields for the regular and random cases, respectively. &#39;ni&#39;, &#39;nj&#39;, &#39;nk&#39; are the numbers of grid points along x, y, and z directions. &#39;xc&#39;, &#39;yc&#39;, &#39;zc&#39; are the cell center locations. &#39;u3d&#39;,&#39;v3d&#39;,&#39;w3d&#39; are the three-dimensional time-averaged velocities at each grid point. &#39;vof&#39; is the volume-of-fluid field used by the immersed-boundary method to prescribe the fluid-solid interface (vof=1 in fluid and 0 in solid), at each grid point. &#39;vof&#39; contains the information of sediment grain distribution and bed roughness geometry. Only the subsurface data (those below the sediment crest) are shared due to dataset size limit.</p> <p>2. Particle-tracked subsurface flow paths and corresponding transit time distributions</p> <p>The mat files &ldquo;xxx_pathline&rdquo; store the (x,y,z) location of each point (saved as &#39;StrX&#39;, &#39;StrY, &#39;StrZ&#39;) along the subsurface paths, discretized by uniform steps of travel time (with time intervals of 0.1 for &#39;A&#39; and 0.01 for &#39;MD&#39; cases, normalized by channel height and friction velocity). The files &ldquo;xxx_TT&rdquo; store the array of transit times corresponding to the tracked paths, where the 1d array T is the transit time. &#39;A&#39; denotes calculations based on time-mean advection only, while &#39;MD&#39; denotes calculations accounting for additional molecular diffusion. &#39;Interface&#39; and &#39;3DiameterBelow&#39; indicate that the particles were released at the interface and -3 D below the interface, respectively.</p>