**Yuchao Chen, Armin K. Silaen and Chenn Q. Zhou \***

Center for Innovation through Visualization and Simulation (CIVS), Purdue University Northwest, 2200 169th Street, Hammond, IN 46323, USA; chen2058@pnw.edu (Y.C.); asilaen@pnw.edu (A.K.S.) **\*** Correspondence: czhou@pnw.edu; Tel.: +1-219-989-2665

Received: 25 May 2020; Accepted: 13 June 2020; Published: 17 June 2020

**Abstract:** The present study proposes a complete 3D integrated model to simulate the top-blown supersonic coherent jet decarburization in the electric arc furnace (EAF) refining process. The 3D integrated model avoids the direct simulation of the supersonic coherent jet interacting with the liquid steel bath and provides a feasible way to simulate the decarburization in the liquid steel-oxygen two-phase reacting flow system with acceptable computational time. The model can be used to dynamically predict the details of the molten bath, including 3D distribution of in-bath substances, flow characteristics and bath temperature and provide a basis for optimizing the decarburization rate or other required parameters during the refining process.

**Keywords:** supersonic coherent jet; decarburization; steel refining; EAF; CFD
