*Article* **On the Response of a Herschel–Bulkley Fluid Due to a Moving Plate**

**N'dri Arthur Konan 1,2, Eilis Rosenbaum <sup>1</sup> and Mehrdad Massoudi 1,\***


**\*** Correspondence: mehrdad.massoudi@netl.doe.gov

**Abstract:** In this paper, we study the boundary-layer flow of a Herschel–Bulkley fluid due to a moving plate; this problem has been experimentally investigated by others, where the fluid was assumed to be Carbopol, which has similar properties to cement. The computational fluid dynamics finite volume method from the open-source toolbox/library OpenFOAM is used on structured quad grids to solve the mass and the linear momentum conservation equations using the solver "*overInterDyMFoam*" customized with non-Newtonian viscosity libraries. The governing equations are solved numerically by using regularization methods in the context of the overset meshing technique. The results indicate that there is a good comparison between the experimental data and the simulations. The boundary layer thicknesses are predicted within the uncertainties of the measurements. The simulations indicate strong sensitivities to the rheological properties of the fluid.

**Keywords:** boundary layer; Herschel–Bulkley fluid; yield stress; Carbopol; cement
