Comments on: 在 COMSOL Multiphysics 中执行弱形式 - //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics 发布博客 Tue, 27 Feb 2024 09:12:32 +0000 hourly 1 https://wordpress.org/?v=5.7 By: 若倩 林 //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-28223 Tue, 27 Feb 2024 09:12:32 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-28223 In reply to Kaixi Tang.

您好,请问弱贡献-2test(T)替换成狄拉克雷边界条件-2(或者2,2testT等),计算出结果不一样,并且前者lambda为-2,后者为-1.75。

]]>
By: 若倩 林 //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-28213 Tue, 27 Feb 2024 09:11:30 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-28213 您好,请问弱贡献-2test(T)替换成狄拉克雷边界条件-2(或者2,2testT等),计算出结果不一样,并且前者lambda为-2,后者为-1.75

]]>
By: Kaixi Tang //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-23793 Tue, 29 Aug 2023 08:23:12 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-23793 In reply to 鑫 周.

您好,可以在该点上对变量“lambda2”做派生值计算得到。它对应的是,使得定义在该点的狄式边界得以精确满足的拉格朗日乘子的大小,即“通量”的大小。

]]>
By: 鑫 周 //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-23713 Thu, 24 Aug 2023 09:13:44 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-23713 请问最后的-2是通过什么操作显示出来的

]]>
By: Qihang Lin //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-23163 Tue, 25 Jul 2023 03:08:27 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-23163 In reply to Yonghao Wen.

行列式建议请拆开化简后再输入至软件中。

]]>
By: Yonghao Wen //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-20393 Fri, 24 Feb 2023 06:24:24 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-20393 你好,我想知道comsol中是否可以计算行列式的值

]]>
By: Kaixi Tang //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-17523 Wed, 01 Jun 2022 03:25:36 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-17523 In reply to Ying Li.

您好,ec.d 可以理解为二维模型中平面外的厚度,它会影响仿真中的总能量的计算。

]]>
By: Ying Li //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-17371 Tue, 17 May 2022 22:22:50 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-17371 请问我在进行热电模块中,注意到电流模块的弱形式中乘了有一个ec.d贡献因子的量((具体,ec.Jx*test(Vx)+ec.Jy*test(Vy)+ec.Jz*test(Vz))*ec.d),请问这个量具体作用时什么?调整ec.d的物理意义是什么,谢谢啦~

]]>
By: Qihang Lin //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-17173 Mon, 09 May 2022 07:43:52 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-17173 In reply to c d.

不清楚您具体是如何设置该算子得到的这个报错信息。一般而言该项并未在PDE建模的算式左边部分有对应可以填入的位置,因此可以考虑将其拆分整理后挪至右边源项写入您的表达式中。

]]>
By: c d //www.denkrieger.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/#comment-17002 Thu, 21 Apr 2022 09:34:02 +0000 http://com.staging.comsol.com/blogs/?p=137551#comment-17002 您好,

我输入的弱形式含有(u·∇)算子,计算的时候报错(Expressions of the Nabla operator is not supported.),应该怎么解决呢?

]]>