Numerical Simulation of Vortex-Induced Vibration of Circle Cylinders Based on Reynolds Number Similarity

摘要

A method based on Reynolds number similarity, of the vortex-inducedvibration (VIV) of circle cylinders is proposed to achieve VIVsimilarity between prototype and tested model. Because the mode ofvortex shedding highly depends on Reynolds number, the VIV responseof a circle cylinder is closely related to Reynolds number and reducedvelocity. However, the scaled model test of circle cylinder's VIV isnowadays designed based on Froude number similarity but Reynoldsnumber not similar under the same fluid for both model and prototype.Therefore, the VIV response of tested model is not similar to that of theprototype because they have different vortex shedding modes. It meansthat the test results can not be used to predict the VIV response of theprototype according to the scaling law based on Froude numbersimilarity. In this paper, the relationship between prototype and modelbased on Reynolds number similarity has been deduced. The prototypeand three scaled models with different similarity schemes have beensimulated using CFD to validate the method. The results show that thesimilarity between prototype and model is satisfied by the Reynoldsnumber similarity and both Froude number and Reynolds numbersimilarity. But the similarity between prototype and model is notsatisfied by Froude number similarity.