In the Stationary study step, we create an auxiliary sweep of “visc_ramp” for values of 1000, 100, 10, and 1. The auxiliary sweep will find a solution for the first value of “visc_ramp” (1000) and use this solution as the initial condition for solving the next value of “visc_...
, since the constraint in this problem depends only on the solution and not on its spatial derivative. Solving this problem for a sequence of increasing penalty parameters, while reusing the previous solution as an initial estimate, we get the result shown below. Finding the shortest path around...
often, a becomes only slightly negative (due to approximations in the solution process)。 then, a possible solution is to use (a+e)b, where e is a small constant。 another remedy is to use abs(a)b. if you do want to h 28、ave a complex number ab, go to the advanced tab of ...
After the first iteration the copper plate should use the previous solution as the initial condition. Do this by specifying the temperature variable T in the init1 feature: ht.feature('init1').set('T', 1, 'T') To change the solver settings so that the initial value points the solution ...
在之前的博客文章中,我们讨论了近轴高斯光束公式。今天,我们将讨论更精确的高斯光束公式,COMSOL® 软件从5.3a 版本开始提供此公式。这种基于平面波展开的公式可以比传统的近轴公式更精确地处理非近轴高斯光束。 高斯光束的近轴性 众所周知的高斯光束公式仅适用于近轴高斯光束。近轴意味着光束主要沿光轴传播。有几篇论文...
Alternatively, you can use the + operator as follows: a = a + b; which is equivalent to: a = "string A" + " and string B"; and equivalent to: a = "string A" + " " + "and string B"; where the middle string is a string with a single whitespace character. Comparing Strings...
The advantages of porous structures DRCers include: 1) they can effectively scatter light between the interface of polymer and air; 2) they can be fabricated by solution-based and scalable methods, such as freeze-drying, phase separation, or electrospinning [41,42] and; 3) their ability to ...
the software does not add any additional condition to the model.\ • If the time derivative of a state variable appears somewhere in the model during a time-dependent solution, the state variable needs an initial condition. Models that contain second time derivatives also require an initial val...
Diagnostics : Error Messages Error Messages This section summarizes the most common error messages and solver messages generated by COMSOL Multiphysics. All error messages are numbered and sorted in different categories according to the following table. Table 2-1: Error Message Categories Numbers Category...
Modeling a Periodic Heat Load _ COMSOL周期性热载荷的施加