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如题,做丁坝绕流的流场分析,用k-e realizable模型,雷诺数9500,固定流速和水位的边界条件。做验证的时候,雷诺应力的平均值<u'u'>、<u'v'>算出来总是偏小,这个是rans模型固有的缺陷吗,工程领域可以取信用rans计算出的雷诺应力平均值的结果吗?