Due to the pressure gradient increasing downstream, the boundary layer separation phenomena may occur on the divergent channel flow wall. Still, several methods have been applied to control or postponed the separation. Exerting a magnetic field on the fluid flow is one solution. In the present research, we aim to investigate the impact of magnetic fields on the separation location in a divergent channel numerically. Hence, the finite volume method using the OpenFOAM CFD toolbox is employed, and a code for 2-D divergent channel flow under a non-uniform magnetic field is developed. The obtained results have been validated in comparison with previous studies. The results are presented for a test case of the channel with divergence half-angle equals 2.5°, 30 cm length, and 2 cm inlet height. It is demonstrated when Ha increases from 0 to 2, the separation points for liquid lithium fluid flow with Re = 208.33 are postponed from 12.93 cm to 23.18 cm. Moreover, it is shown that the separation phenomena disappear entirely for the Ha value of more than 3.

由于下游的压力梯度增加，边界层分离现象可能发生在发散的通道流壁上。尽管如此，已经应用了几种方法来控制或推迟分离。在流体流上施加磁场是一种解决方案。在本研究中，我们旨在数值研究磁场对发散通道中分离位置的影响。因此，采用了使用OpenFOAM CFD工具箱的有限体积方法，并开发了在非均匀磁场下二维发散通道流动的代码。与以前的研究相比，所获得的结果得到了验证。给出的结果是通道的测试情况，发散半角等于2.5°，长度为30 cm，入口高度为2 cm。证明当Ha从0增加到2时 Re = 208.33的液态锂流体流动的分离点从12.93 cm推迟到23.18 cm。而且，表明当Ha值大于3时，分离现象完全消失。