a numerical simulation method for characterizing fluid channeling along large - aperture fractures of reservoirs relates to the field of petroleum reservoir development research and computational fluid dynamics . the conventional method can not effectively represent the rapid fluid channeling along large - aperture fractures . aiming at solving the above technical problem , an advanced method is provided in the present invention . in the invented method , the geometric similarity and hydraulic similarity treatments of large - aperture fractures can be made simultaneously , moreover , the traditional numerical simulation software was improved to be an unstructured grid simulator . therefore , the method of the present invention can effectively simulate the rapid fluid channeling along large - aperture fractures , consequently it can ensure the reliability of the simulation results and provide reasonable reference for the adjustment and optimization of oil field development plans . the present invention is simple in principle and easy to use , thus it has a great value of application and popularization .