How to specify initial conditions for two different subdomains in PDE solver?

Question

Ankit Gaur 2019-8-20

0
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https://ww2.mathworks.cn/matlabcentral/answers/476792-how-to-specify-initial-conditions-for-two-different-subdomains-in-pde-solver

回答： Ravi Kumar 2019-8-29

I am using the graphic PDE solver app in MATLAB. My aim is to model a diffusion equation in a 2-D rectangular space. I want have an initial condition where the molecules are released in the impulses form as initial condition, which requires kronecker delta function

However when I try to input the same using `eq' in the parameter values it does not reflect anaychange in the solved PDE.

Is it possible to apply kronecker delta function in the PDE solver as initial condition?

As a work around, I try to create a very small circular domain in the rectangular space to give it the necassary initial condition. I tried to have initial condition in the circualar domain different than in the rectangular domain. In cicle I tried to have initial condition as `1' and in rectangle as `0'. However, I am not able to assign different initial condition in the circular and rectangular domain. Both are selected simulataneously. How can one specifty two diffrerent initial conditions to two different subdomains?