这就需要提供额外的自由度来满足几何光顺的要求。
Hence, additional degrees of freedom are needed to meet the geometric smoothness requirements.
为了提高收敛速度，采用当地时间步长、残值光顺的加速收敛措施。
Using local time stepping and implicit residual smoothing to accelerate the convergence.
常用的三次样条曲线几种端值条件如简支端、抛物端已不能完全满足曲线光顺的要求。
Several commonly adopted end value conditions for cubic spline do not meet the requirements of curve fairing completely.
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