反弹格式与半步长反弹格式有什么区别？

7楼

直接看格子，反弹格式需要2个时间步返回，而半步长只需要1个时间步返回，好像不用处理计算边界。
但是书上好像对反弹边界只用了1个时间步，那半步长怎么处理？
麻烦指点一下，先谢过！

luo@odu.edu

There is only bounce-back (BB) scheme and the so-called "half-way" BB scheme is an misunderstanding. If you carry out a careful analysis, you will find that the location where the imposed no-slip boundary conditions are satisfied depends on the viscosity for the LBGK model. To completely remove this intrinsic defect of the LBGK model, you need to use the MRT model, in which certain way of inter-dependent relaxation rates must be used.

The work was pioneered by Ginzburg and others.