The aim of this article is to study experimentally and numerically the influence of the inclination of a plate placed near a wall on flows of Newtonian and yield stress fluids. The drag and lift forces were particularly studied. The inclination of the plate varies between 0 degrees and 90 degrees. The inertia of the fluid is considered negligible. The effects of the Oldroyd number, the shear-thinning index and the inclination of the plate on drag and lift are shown. Experimentally, an instrumented flume was used with a Carbopol gel as a yield stress fluid model. The measured lift and drag forces are compared to the numerical results and the literature data. The elasticity and plasticity effects are discussed. (C) 2019 Elsevier Ltd. All rights reserved.