Flow between parallel plates or not.

[umi0810]

Hi,

I'm doing 2D modeling with COMSOL and my design is about a flow (in the x direction) inside a structure passing square objects, so I thought I could model it on the mechanics of flow between parallel plates.

Unfortunately, the square objects are of the same height as the structure and does not extend for a very long distance in the z direction (height in z direction:width in y direction= 1:100), which is one of the assumptions for that model to work.

Also, the volume of the structure is quite small (10mm x 10mm x 0.1mm) and the inlet resides on the same side as the outlet.

When I tried to force the inlet with fluid velocity based on the flow between parallel plates model, the fluid behaves strangely (like flowing against gravity and stuff ^^;).

Can anyone tell me of any other model that I can base my flow on?

 

[delplace]

I don't really understand your geometry. If it is a square or rectangular duct, you just have to solve navier-stocks equations in such geometry. Then depending on the flow regime i.e the Reynolds number value, you will be in laminar, transition or turbulent. In the case of turbulent flow, many authors showed that in complex geometries, you have recirculation zones.

 

[charng]

I would first commend you for using a simulation software like COMSOL to model your flow. It shows that you are taking a systematic and data-driven approach to your research.

In terms of your question about flow between parallel plates, it is important to consider all the assumptions and limitations of this model. As you have mentioned, one of the key assumptions is that the plates extend for a long distance in the z direction. This is necessary for the model to accurately represent the flow behavior. Additionally, the volume of your structure and the placement of the inlet and outlet may also affect the results.

Given these limitations, it may be necessary to explore other models that can better represent your flow conditions. One option could be the Navier-Stokes equations, which take into account the effects of viscosity and turbulence on fluid flow. Another option could be the Reynolds-averaged Navier-Stokes (RANS) equations, which are commonly used for turbulent flow simulations.

It is also important to carefully consider the boundary conditions and assumptions for any model you choose to use. This will help ensure that your simulation results are accurate and meaningful.

I hope this helps guide you in selecting a suitable model for your flow simulation. Keep in mind that as a scientist, it is important to constantly evaluate and adjust your approach as needed to ensure the accuracy and validity of your results. Best of luck with your research!