Coherent structures of a hydrothermal buoyant plume in the near-field obtained through LES at ultra-high resolution.

<p>Three-dimensional coherent structures identified by iso-surfaces of lambda2 = -1 (a) and lambda2 = -10^(-2) (b) using the method by Jeong and Hussain (1995) for a buoyant forced plume (Gamma0 = 1.14, where Gamma is the flux balance parameter defined by B. Morton and Middleton, 1973). The colormap represents the absolute temperature anomaly. The time interval in the video corresponds directly to the simulation time of the plume.</p> <p>This is an output of a Large Eddy Simulation (LES) performed using the <a href="http://basilisk.fr/">Basilsk</a> code, an adaptive mesh refinement (AMR) code featuring a second-order accurate finite-volume solver for the Navier&ndash;Stokes equations. These equations are solved in their three-dimensional Boussinesq form for an incompressible fluid. The plume modeled here represents a typical hydrothermal vent, with source conditions set to 300 &deg;C for temperature, 0.7 m/s for velocity, and a vent radius of 2.8 cm.</p> <div> <div> <div>Source :</div> <div>Jeong J, Hussain F. On the identification of a vortex.&nbsp;<em>Journal of Fluid Mechanics</em>. 1995;285:69-94. doi:10.1017/S0022112095000462 <div>MORTON, B. R. et MIDDLETON, Jason. Scale diagrams for forced plumes. <em>Journal of Fluid Mechanics</em>, 1973, vol. 58, no 1, p. 165-176.</div> </div> </div> </div>