FlowFit II Implementation Details

Abstract

Since 2013 we have been developing methods for spatial interpolation of scattered velocity and acceleration data to complement particle tracking techniques that yield such data with a high enough spatial resolution [Scha14][Scha16]. This presentation highlights some of the properties and implementation details of the methods we termed “FlowFit” and “FlowFit 2”. Both make use of uniform 3D B-splines to represent velocity, acceleration or pressure fields and determine these fields by minimizing a cost function which possibly accounts for some physical constraints as well by penalization. The first generation FlowFit has been used in our submissions of the 4th PIV Challenge [Käh16]. It reconstructs either velocity or acceleration. The second generation FlowFit combines these two reconstruction problems into a single one to exploit more of the physical constraints we know should hold in order to improve the reconstruction quality.