Hello

Does anyone have experience using flow simulation software on very small parts, e.g. 1 micron?

Does the software give accurate results at this scale?

Thanks in advance

Gary

Hello

Does anyone have experience using flow simulation software on very small parts, e.g. 1 micron?

Does the software give accurate results at this scale?

Thanks in advance

Gary

2993 wrote:

Hello

Does anyone have experience using flow simulation software on very small parts, e.g. 1 micron?

Does the software give accurate results at this scale?

Thanks in advance

Gary

Hi. Thanks for your reply.

I'm not sure. I haven't got the sofware but I'm researching it to see if it would meet our needs.

Gary

2993 wrote:

Hi. Thanks for your reply.

I'm not sure. I haven't got the sofware but I'm researching it to see if it would meet our needs.

Gary

Call someone at COSMOS (SolidWorks) and explain to them your especific needs, they know exactly what the application will do, they develop the application. Also, you can talk with your VAR and get a 30 days trial license, but you will need someone that know how to work with the application and know how to model and analyze exactly what you are going to do. Chances are that the VAR do not have that knowledge, but he can contact the right person at SW / COSMOS.

I have this in my notes from the developers:

Flow Simulation is a computational fluid dynamics (CFD) program which solves the Navier-Stokes equations. The Navier-Stokes equation assumes the fluid particles are a continuum. At very small channel thicknesses this assumption may no longer be valid. The accuracy of the Navier-Stokes equations can be defined with the Knudsen number Kn=L/D (L- free path of gas molecules, D - typical diameter size) less than 0.01. At Kn<=0.01 the hypothesis of continuous flow is correct, this case could be calculated with our program. At Kn>10 the gas rarefaction is too much and the hypothesis of continuous flow is not correct. A free path of gas molecules can be estimated with the following relation: L~1.225*Vis*k^0.5/(Ro*a). Here Vis – dynamic viscosity; k – adiabatic power; Ro – density; a – speed of sound.

I have this in my notes from the developers:

Flow Simulation is a computational fluid dynamics (CFD) program which solves the Navier-Stokes equations. The Navier-Stokes equation assumes the fluid particles are a continuum. At very small channel thicknesses this assumption may no longer be valid. The accuracy of the Navier-Stokes equations can be defined with the Knudsen number Kn=L/D (L- free path of gas molecules, D - typical diameter size) less than 0.01. At Kn<=0.01 the hypothesis of continuous flow is correct, this case could be calculated with our program. At Kn>10 the gas rarefaction is too much and the hypothesis of continuous flow is not correct. A free path of gas molecules can be estimated with the following relation: L~1.225*Vis*k^0.5/(Ro*a). Here Vis – dynamic viscosity; k – adiabatic power; Ro – density; a – speed of sound.