For the slight air draft, we use the Turbulent Flow interface with a constant air velocity. The first step is to make use of the symmetry, which reduces the model size and thereby the computational time.
#SLIP LENGTH COMSOL 5.3 HOW TO#
In total, I suggest you start small with a single fluid first and then ramp up the complexity to a two-phase model and complex geometries. How to Implement the Evaporative Cooling Effect in a Model. You can also increase the relative tolerance of the solver to make solve faster. The specific system being simulated was the Open Drop experiment and the parameters being investigated were the applied voltage, contact angle at the advancing triple point, and droplet overlap onto neighboring actuated electrodes. For that I usually use direct solver (for robustness). COMSOL to grant insight on various parameters that play a critical role in system performance. After setting up the physics, make sure that the time-dependent solver runs stably.
The moving mesh node (I am not sure which version of Comsol you are using, but this method can be also applied to the newer versions):ĭefine a "prescribed deformation" node for the rotating domain with the prescribed mesh displacement as: DX and DYĦ.
This assure the momentum transfer of the fluid due to the moving wall.ĥ. For the velocity of the moving wall place DXdt and DYdt. Only the walls of the rotating domain need to have a "moving wall" boundary condition. In the fluid flow node, add a flow continuity option and pick the identity pair. To define the rotation of the inner domain in the Cartesian coordinate, create a new variable for the model component and place the following equationsĤ. This can be done by defining a variable and placing the following equations in it:Ĭhange the value to match the angular rotation of you model but be sure you ramp it up correctly.ģ. To define the rotation of the inner domain, you need to define the rotation angle (an) as a function of time. Create the inner and the outer circles and form an assembly with an identity pair typeĢ. To create the 2D rotating geometry, follow these steps:ġ. I suggest you work first with a 2D geometry to get a feel on the required modelling parameters and their effect for a more complex 3D systems. out of experience, that might be tricky to solve due to the addition of time-dependent solver. Ok so you problem is not only a rotating mixing problem but a two-phase.
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