The　present　study　is　concerned　with　the　numerical　simulations　of　Ostwald-de　Waele　fluid　flow　in　a　wavy　trapezoidal　cavity　in　the　presence　of　a　heated　cylinder　situated　at　the　center　of　the　cavity.　The　work　consists　in　characterizing　the　mixed　convection　as　a　function　of　the　intensity　of　heat　flow.　The　flow　behaviour　and　temperature　distribution　in　a　cavity　are　the　main　focus　of　this　study.　The　lower　wall　of　the　cavity　is　fixed　and　heated　while　the　wavy　surface　is　insulated　and　moves　with　a　constant　speed.　The　sloping　walls　are　kept　cold　and　are　subject　to　zero　no-slip　conditions　for　velocity　components.　The　whole　setup　is　modeled　as　a　set　of　coupled　partial　differential　equations　and　is　solved　by　the　Finite　Element　Method.　For　pressure　and　velocity　approximations,　we　use　the　stable　finite　element　pair　P2−P1,　while　for　temperature　approximation　we　use　the　space　of　linear　polynomial　as　P1.　The　ranges　of　the　parameters　involved　in　the　study　are　the　Ostwald-de　Wale　index　(0.5≤n≤1.5),　Prandlt　number　(1≤Pr≤10),　Grashof　number　(100≤Gr≤1000),　the　number　of　undulation　(0≤λ≤4),　and　the　non-dimensional　amplitude　of　the　wavy　surface　(0.02≤A≤0.06).　The　major　findings　of　the　study　are　shown　using　velocity　profile,　streamlines,　and　isotherms.　Moreover,　the　kinetic　energy　and　average　(Nuavg)　Nusselt　number　is　determined　for　various　values　of　the　parameters　involved.　©　2021