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Several numerical methods for measuring the bending rigidity and thespontaneous curvature of fluid membranes are studied using two types ofmeshless membrane models. The bending rigidity is estimated from the thermalundulations of planar and tubular membranes and the axial force of tubularmembranes. We found a large dependence of its estimate value from the thermalundulation analysis on the upper-cutoff frequency q_{cut} of the least squaresfit. The inverse power-spectrum fit with an extrapolation to q_{cut} -> 0yields the smallest estimation error among the investigated methods. Thespontaneous curvature is estimated from the axial force of tubular membranesand the average curvature of bent membrane stripes. The results of thesemethods show good agreement with each other.

Measurement of the bending rigidity and spontaneous curvature of fluid membranes in simulations