如何得到圆板（圆柱）较细的网格划分？

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如图所示1/4圆板（圆柱），对圆弧段manualsize后，采用VSWEEP命令划分网格时，生成类似于“ Shape testing revealed that 1620 of the 3780 new or modified elements violate shape warning limits.”的警告。随后，用check命令检查，发现对于靠近圆心的单元有类似于“Brick element 721 has an aspect ratio of 77.07, which exceeds the warning limit of 20.”、“ Brick element 721 has a Jacobian ratio of 44.59, which exceeds the warning limit of 30.”的警告。做以下改进：不但对圆弧段manualsize，而且对直线段manualsize并设置ratio，让靠圆心处划分更加密一些，仍然无济于事。如何在保证网格划分较细的条件下，防止以上警告的出现？受此问题困扰多日，请高手多多指教！非常感谢！