Opposed flame spread over cellulose-insulated copper wires was studied numerically under varied forced flow velocities and insulation thickness in normal gravity environments. The wire samples used in this study have cellulose as insulation over core metal. Copper is used as a core metal for this study. The opposed flame spread was studied for the wire diameter of 1 mm (0.6 mm copper metal as core and a 0.2 mm insulation thickness of cellulose) with varied forced flow velocities of 10, 15, and 20 cm/s. The numerical study was carried out using an in-house developed 2D model for laminar diffusion flame spread over thermally thick charring wires. Validation for the code was done by conducting experiments at normal gravity environments in an ambiance of 25% oxygen in nitrogen with varied opposed flow speeds of 10, 15, and 20 cm/s. This study reveals that the flame spread rate decreases with an increase in opposed flow velocity and increases with a decrease in insulation thickness. The outcomes of this study were discussed in detail in this article.