Yeah, I noticed an old discussion with the same problem and solved it.
在 2016年9月16日星期五 UTC-5上午10:42:30，Bruno Turcksin写道：
> On Friday, September 16, 2016 at 11:35:09 AM UTC-4, Weixiong Zheng wrote:
>> When running the program, the solution is zero on the left side as
>> expected. However, the right side solution is something nonzero. Since I am
>> using the same apply_boundary_condition settings, I am supposed to get zero
>> solution on both boundaries, right?
> I don't think so. I think that in 1D, the left side has always a
> boundary_id of 0 and the right side has a boundary_id of 1.
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