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Two Delayed-Detached Eddy Simulation(DDES)models,and a Large-Eddy Simulation(LES)model are used to investigate the turbulent flows and mixed convection between a hot plate and a cold plate via the software FLU-ENT.The two DDES models include Production-limited DDES(PL-DDES)and Improved DDES(IDDES)models.The Wall-Adapting Local Eddy-Viscosity(WALE)model is the used LES model.The numerical computations are performed at Reynolds number Reb=4494 and different Richardson numbers Ri=0.025,0.048,0.1.The comparing data is from the Direct Numerical Simulation(DNS)at Reb=4494 and Ri=0.048.The comparison reveals that the two DDES models have better performance in predicting time-averaged parameters than the WALE model in the aiding flow.The best predicted time-averaged results are obtained by the PL-DDES model in the opposing flow.Furthermore,the results of different Ri obtained by the PL-DDES model agree well with the DNS data.