Money Versus Time

We propose a new flow condition for evaluating flow control techniques through DNS of internal flows. Instead of keeping either a flow rate or a pressure gradient, the new simulation approach is to maintain the total power input, i.e., the sum of pumping and control power inputs. This new condition is the most suitable approach for energetic analyses of flows with/without control in order to investigate how the applied pumping energy is eventually dissipated by the fluid viscosity. We first implement the constant power input condition in DNS, and reevaluate existing flow control techniques in the new framework.