COMPARISON OF SEVERAL DISCRETE ARITHMETIC SCHEMES FOR SIMULATING A CONSTRAINED JET AND A LAB-SCALE TANGENTIAL FIRED FURNACE

For tangential fired furnace, the false diffusion will occur when the flow is oblique to the grid lines. It is a major factor to cause serio us errors to the prediction of tangential fired furnace. In order to d ecrease this false diffusion, this study has considered several altern ative to the widely used upwind-differencing scheme with the aim of id entifying which could be regarded as the most suitable in a general-pu rpose solving procedure for tangential furnace. The representations ad opted are 'hybrid', 'quick' and '27-point' treatments. Here, '27-point ' is a new discrete arithmetic scheme developed by the authors. All th ese schemes are used to simulate a constrained jet and a lab-scale tan gential furnace and to compare solutions with the datum. Overall, the '27-point' approximation emerged as the most satisfactory for simulati ng tangential furnace.