Mesoscopic simulations of inertial drag enhancement and polymer migration in viscoelastic solutions flowing around a confined array of cylinders

We study the flow around a periodic array of cylinders using mesoscopic viscoelastic fluid that mimics polymeric solutions. model our employing novel method based on Smoothed Dissipative Particle Dynamics and FENE springs. characterize static dynamic properties solutions compare results with theoretical predictions Zimm model. After rheological characterization modeled solutions, we simulate confined cylinders. The balance between inertia elasticity in simulations is studied wide range Reynolds (Re) Weissenberg (Wi) numbers. find increasing rate reduces drag coefficient cylinder up to critical Re corresponding minimum. Thereafter, becomes dominant encounter enhancement for all studied, including Newtonian solvent. With use simple viscous inertial contributions drag, conclude effects are driving increase experienced by cylinder. In simulations, also observe migration polymer chains away from channel walls wake stress gradients induced curvature streamlines convection depleted layers at as principal mechanisms chains. extent correlates well Mach number (Ma = Wi ) suggesting both elastic play role this phenomenon. • A behavior presented. periodically spaced investigated. Drag explained combining drag. Polymeric