Centre filling of a cylindrical silo results in a peaked grain pile with a high concentration of fines in the bulk core restricting airflow. Fines are also known to have higher mycotoxin levels than whole grain. Coring is recommended to minimise fines and to increase localised airflow through the top grain regions. However, the proportion of coring is not a generalised factor when silo dimensions and fan capacities are considered. Also, the coring proportion used should be minimised to maximise storage capacity and provide good economic returns. A study of sequential coring was conducted using a computational fluid dynamics method to predict the optimised coring volume for a 1000 t silo fitted with 3 kW and 5 kW fans. Each configuration following coring was validated using airflow data measured on the top grain surface of the 12.8 m diameter on-farm silo.

Results showed that the model predicted standard errors of 0.0009–0.0024 m s⁻¹ for 16 t, 32 t, 48 t, 80 t, and 158 t coring cases. When fully loaded, around 9% (80 t) of the total mass was required to be unloaded to exhibit the desired airflow in the top-grain region using a 3 kW fan. However, the unloaded mass decreased to 2% (16 t) for the same effect with a 5 kW fan. Thus, a 5 kW fan was recommended as it decreased the proportion of dead zones in the lower bulk region by 65% in a typical 1000 t silo.

圆柱形筒仓的中心填充会导致峰谷堆，散粒中的细粉浓度很高，从而限制了气流。还已知细粉比全谷物具有更高的霉菌毒素水平。建议取芯，以减少细粉并增加通过顶部晶粒区域的局部气流。但是，在考虑筒仓尺寸和风扇容量时，取芯的比例不是一个普遍的因素。另外，应最小化所使用的取芯比例，以最大程度地增加存储容量并提供良好的经济回报。使用计算流体动力学方法对连续取心进行了研究，以预测装有3 kW和5 kW风扇的1000 t筒仓的最佳取心量。取芯后的每个配置都使用在12的顶部晶粒表面上测得的气流数据进行了验证。

结果表明，该模型预测16 t，32 t，48 t，80 t和158 t取芯情况下的标准误差为0.0009–0.0024 m s ^-1。满载时，需要卸载约9％（80 t）的总质量，以使用3 kW风扇在顶部颗粒区域显示所需的气流。但是，对于5 kW风扇，相同的效果将空载质量降低到2％（16 t）。因此，建议使用5 kW的风扇，因为在典型的1000 t筒仓中，它可将下部散装区域中的死区比例降低65％。