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This paper reports a CFD modeling study on the flow of gases in an electroslag furnace during Protective Gas Electroslag Remelting(PESR) process by a commercial code FLUENT. The Realizable k−ε turbulence model, Do radiation model and Mixture model are amply used in FLUENT code to compute the flow of gases in the furnace under different argon gas flow, and the influence of argon gas flow on air volume fraction in the furnace is obtained. Finally, a suited suggestion on argon gas flow during PESR process is presented.

This article investigates the periodically intermittent event‐triggered control (PIEC) for delayed nonlinear systems. The PIEC strategy, by means of introducing event‐triggered strategy into periodically intermittent controller, is proposed to reduce the amount of communications while still preserving a satisfactory closed‐loop performance. Some sufficient conditions are derived, which are incorporated into the controller design to determine the controller gain and the triggered parameters in a co‐design case. The overall strategy ensures a global asymptotic stability for the closed‐loop system and the existence of positive dwell time between two consecutive events. Therefore, Zeno behavior is excluded. Finally, the simulation example of Lu oscillator is given to verify the effectiveness of the theoretical results.