Hello, I am working on a project that has been troubling me for quite some time. I am trying to combine FSI (Fluid-Structure Interaction) with Transport of Diluted Species for an actuator-based drug releasing device in 2D axial setting. The simulation that I am working on does not involve any electric field nor magnetic field (although in reality it does. Instead, I am using boundary load for force created by magnetic field).
The problem is that when I run FSI or Transport of Diluted Species separately, they give expected result with very good accuracy. It's when I combine two physics together, either in separate steps in a study (ie two time-dependent studies) or in one time-dependent studies, the result does not come out correctly. I have been set to run FSI first then transport of diluted species since I figured the convection process entirely depends on the velocity profile created from FSI, but not the other way around.
Also, the simulation seems to work alright as long as the boundary load is applied up to certain time. I am using a sine wave to test the oscillating nature of the boundary load. I shifted the sine wave to always be applied in negative z-direction throughout the simulation. But once an extrema of boundary load is reached and the load starts to change its change in direction (changing derivative of the boundary load if you consider the boundary load as some sinodual function), the simulation starts to act weird.
If specific dimension is required to solve this problem, I will put the general dimension in reply, but for the time being, is there something, like in solver settings or module to "smooth" the multiphysics simulation like deformed mesh physics, that I am missing before running the simulation? I am fairly new to using COMSOL, and any input and help on how to address this issue will be very much appreciated.
The problem is that when I run FSI or Transport of Diluted Species separately, they give expected result with very good accuracy. It's when I combine two physics together, either in separate steps in a study (ie two time-dependent studies) or in one time-dependent studies, the result does not come out correctly. I have been set to run FSI first then transport of diluted species since I figured the convection process entirely depends on the velocity profile created from FSI, but not the other way around.
Also, the simulation seems to work alright as long as the boundary load is applied up to certain time. I am using a sine wave to test the oscillating nature of the boundary load. I shifted the sine wave to always be applied in negative z-direction throughout the simulation. But once an extrema of boundary load is reached and the load starts to change its change in direction (changing derivative of the boundary load if you consider the boundary load as some sinodual function), the simulation starts to act weird.
If specific dimension is required to solve this problem, I will put the general dimension in reply, but for the time being, is there something, like in solver settings or module to "smooth" the multiphysics simulation like deformed mesh physics, that I am missing before running the simulation? I am fairly new to using COMSOL, and any input and help on how to address this issue will be very much appreciated.