The paper “Parametric approach to promote a divergence-free flow in the image-based motion estimation with application to bioirrigation“, co-authored by Naratip Santitissadeekorn, Christof Meile (University of Georgia), Erik Bollt (Clarkson University), and George Waldbusser (Oregon State University), has been published in the European Journal of Applied Mathematics (open access, link here). In the paper, flow fields are determined from image sequences that depict the distribution of a tracer that is carried with the flow. Full abstract and details available at the above link. The screenshot below shows Figure 2 from the paper.