Abstarct: The revision of energy loss coefficients in entrance and outlet of a culvert was done experimentally in the past. Related experts were defined factors such as the culvert’s geo-formation and the outlet and entrance transition types, which are efficient on energy loss coefficients amount. In fact, in order to estimate the local energy loss coefficients, pressure gauges, are utilized on both sides of the culvert. baxsed on the difference of the two pressure amounts surveyed, and baxsed on Bernoulli equations, the energy loss is calculated and the loss coefficients are obtained alternatively. Technically, the goal in this research is to process the methods using numerical simulations. The numerical simulations used for culverts with different transitions are defined with various turbulence models and in comparison with experimental data, the most proper turbulence model is possessed. Due to the research, the numerical simulation ability is estimated for culverts. It is obvious that the variety in turbulence simulations may affect the results in different manners. The first step is to specify the suitable simulation for the culvert model. The Fluent software is utilized to numerically model the culvert. baxsed on the significance of a fluid flow manner, some efforts are conducted to familiarize the readers with turbulent flows along with dominated equations and the past methods. The simulations for rectangular box culverts and circular culverts are done in four section modes and in each mode, the energy loss coefficients for the entrance and outlet of the culvert with different turbulences are calculated. After the simulations are done using various turbulence models for culvert entrance and outlet and with different transitions in Fluent software, and in comparison with the results obtained from experiments, the k ɛ realizable model is suggested as the most suitable turbulence model.