DrAmine
Ansys Employee

You are using a surface integral that means the shear stress will be multiplied with area of the surface/facets. So the unity will be Pa*m^2. To get the forces use fore reporting and prescribe the direction along which thy will be calculated. Or you check the components of wall shear force acting on your surface. In Fluent you have two or three components of shear force available for postprocessing.