Alessandro Rizzo
Open your COMSOL model and navigate to the appropriate physics interface. Identify the boundary where you want to apply the boundary conditions. Right-click on the boundary node (e.g., 'Boundary 1') and choose an appropriate boundary condition type for the variable you're working with, such as Concentration or Saturation. In the 'Settings' window of the boundary condition you just added, you'll see an option to input the expression for the variable you're working with (e.g., 'Concentration' or 'Saturation'). You can use the Step function to create a time-dependent expression that transitions between two values. To implement the time-dependent Dirichlet boundary condition, use the following expression for Saturation (S): Now, you need to implement the zero-flux boundary condition. In COMSOL, the zero-flux boundary condition is usually applied by not setting any specific boundary conditions for the flux term. If you've chosen the appropriate boundary condition type in Step 2, COMSOL should automatically apply a zero-flux condition to the flux term when S=0. Finally, check your other boundary settings and click 'Build All' to solve your model.
Hello,
to implement a time-dependent Dirichlet boundary condition and a zero-flux boundary condition for different times in COMSOL, you can use a combination of the built-in Step function and your boundary condition equations. Here's a step-by-step guide:
S = 1*(1 - step(t - 5))
This expression sets S=1 for t=5. The step function transitions from 0 to 1 at t=5.
By following these steps, you should be able to apply a time-dependent Dirichlet boundary condition and a zero-flux boundary condition for different times in your COMSOL model ;)
2 votes
1 thanks
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Carbon Materials
- Graphite
- Graphene
More Abul Borkot Md Rafiqul Hasan's questions See All
Similar questions and discussions