Several preconditioning techniques have been used to reduce the condition number of the operator equations.

文中采用了几种预条件技术来降低算子方程的条件数。

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However, the accuracy of preconditioned schemes was not satisfied because of the poor performance of stability of preconditioning techniques used in viscous flows.

然而，对于粘性流，预处理计算稳定性较差，从而影响了计算精度。

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However, the accuracy of preconditioned schemes was not satisfied because of the poor performance of stability of preconditioning techniques used in viscous flows.

然而，对于粘性流，预处理计算稳定性较差，从而影响了计算精度。

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