The relation between distribution of temperature and fluid flow field in tundish for concasting has been analyzed by using theory of field synergy and the distribution of temperature and fluid flow field in a tundish for six strands at a steel works was simulated and numerically calculated. Results showed that as tundish without flow control devices

the synergy between temperature gradient field and fluid flow field was better

the temperature gradient of liquid steel was great i. e. the max temperature differential - 27 K and the max temperature differential at outlet - 3 K with large entrancy dissipation value and large difference between curves of residence time distribution at outlet； as tundish with baffles

the degree of synergy between temperature gradient field and fluid flow field decreased

the distribution of liquid steel was even i. e. the max temperature differential - 12 K and the max temperature differential at outlet - only 0. 3 K

the value of entrancy dissipation decreased by 57. 6% and the curves of residence time distribution at outlet were similar.