Learning Forum

[MarkA]

Hello everyone,

In my current simulations I am modeling the flow through a nozzle, which connects a micro-channel to a fluid chamber. The model is in 2D and a pressure BC (pressure-outlet, 0 Pa static) is applied to the inlet of the micro-channel and another pressure BC (pressure-inlet, 1 kPa static) is applied to the top wall of the fluid chamber. A parametric study needs to be conducted to determine the influence of various geometric parameters. These parameters are shown in the figure below. Before conducting a DOE, I want to perform a Parameters Correlation study to find the most important parameters.

[peteroznewman]

nI suggest you rebuild the sketch to reduce interactions that can cause invalid domains without extensive constraints to keep it valid.nAn example of that would be to have 8 dimensions as the independent inputs as shown in the sketch below. The only constraint needed to assure a valid domain is to require all the inputs to be positive. The sketch is completely defined by various constraints such as symmetry about the X axis. You seemed to want a non-symmetrical volume on the right so there are two values to define how close the wall of the domain comes to the outlet of the nozzle. I choose the angle A3 to be an input. I could have used the height of the nozzle outlet as an input instead and measured the angle as an output parameter. That would have made it easier to calculate H. I did that in the second Archive. Two workbench archives are attached if you want a closer look.nn

[MarkA]

nThanks for this simple suggestion. It simplifies my problem tremendously.nCheers.n

[MarkA]

Dear I have a follow-up question. nIn the picture below, a diffuser is added on the other side of the chamber. This diffuser is parametrized similar to the nozzle per your suggestion. However, how can I ensure that the position of the diffuser stays within the limit of the chamber height, i.e. such that V5+L2+V6 >= V10+L16?nRight now in my DOE I used the limits [0,05 0,2] for V5, V6 and V10, and [0.2 1.0] for L2.n