Turbulent flows through the non-rotating and rotating pipe are simulated by changing three types of the computational boundary conditions at the cross section in the numerical code combining the large eddy simulation (LES) and immersed boundary (IB) method and the effect is evaluated in this study. The computational time of the code with the non-slip conditions in y and z directions is much longer than those of the codes with the periodic and non-slip conditions and with the periodic boundary conditions in both directions, but reproduces the rationally symmetric distributions of the mean quantities. As a result of imposing rotational symmetry on the mean quantities, the rotation effect of the present DNS is qualitatively captured by the results of all the codes.
Watanabe et al. (Wed,) studied this question.
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