I am simulating the deflectiopn of a beam with fixed supports at each end with a concentrated load at the middle. The beam dimensions are 200mm long, 10mm wide, 10mm high. The load is 100N. E=2.1e11 N/m^2. The Simulation result with default mesh is .003429mm. The theoretical deflection is .00296mm. +15.8% error. The deflection equation for a centrally loaded beam fixed at both ends is dy=(P*L^3)/(192*E*I).