 effect surfac curvatur laminar boundari layer flow effect surfac curvatur laminar boundari layer flow laminar flow viscou incompress fluid two-dimension curv surfac investig case curvatur larg case approxim exact equat motion order-of-magnitud analysi equat solv flow surfac surfac pressur gradient analysi pressur gradient normal surfac includ outer boundari condit modifi requir flow curv surfac indic equal reynold number stress convex surfac flat-plate stress concav surfac greater flat plate surfac curvatur case consid modif shape veloc profil outer edg boundari layer requir smooth transit exist viscou flow potenti flow outer edg layer profil neg slope outer edg convex surfac curvatur posit slope concav surfac curvatur 