Secondary Pressure Correction to Improve the SIMPLE Method

The SIMPLE method and its various modified versions have been widely used over the past two decades in the fluid flow modeling. One important feature in these SIMPLE-like algorithms is the use of a pressure correction in the pressure-correction equation, which is known to be effective in correcting the velocity field but not so in correcting the pressure field. This paper presents a modified SIMPLE algorithm to overcome this problem. This modified SIMPLE method, while still using the pressure correction for correcting the velocity field like the SIMPLE method, introduces a secondary pressure correction for correcting the pressure field. Numerical calculations of gas-solid flow in a fluidized bed suggest that this method can accelerate convergence, improve accuracy and save CPU time, compared to the SIMPLE method.