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:
> Weixong,
> 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.
> Best,
> Bruno

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