Study On The Simulation Of Mass Concrete Pipe Cooling Based On Thermal-fluid Coulping Method

Pipe cooling is the most effective and widely used temperature control and crack prevention measures for mass concrete, equivalent algorithm is applied widely to calculate temperature field of massive concrete with cooling pipe in practical engineering now.The algorithm considers pipe cooling on average, and equivalents pipe cooling to hydration heat of cement, considers pipe cooling as negative heat of hydration. There are two main defects in this method: (1) the concrete temperature can not be simulated accurately; (2) the temperature rise of cooling water can not be considered. The thermal-fluid coupling method overcomes the shortcomings of the equivalent algorithm, and becomes a new precise algorithm for calculating the temperature field and stress field of mass concrete with cooling pipes.In practical engineering, there are many parameters which have an influence on the cooling effect. In order to find out the cooling scheme which can meet the requirements of temperature control and economy,it is necessary to do a simulation analysis on these parameters. Based on this point,this paper uses the thermal-fluid coupling method to simulate these parameters which have an influence on the cooling effect, the main studying contents are as follows:(1) It summarizes the current status of concrete temperature control research and pipe cooling research.(2) The principle of temperature field calculation and the advantages and disadvantages of several calculation methods are summarized.(3) The simulation program of mass concrete temperature field with cooling pipe is developed by the ANSYS parametric design language with the second development of ANSYS software package. And the thermal-fluid coupling method is used to analysis the influence of pipe parameters on the cooling effect, and the quantitative effect of pipe parameters is obtained.(4) It uses thermal-fluid coupling method to simulate the traditional cooling method and small temperature difference through engineering examples, the results show that the small temperature diffference can effectively reduce the radial temperature gradient around the cooling pipe , and it has more advantages in reducing temperature stress.