Hello XFlow users.

I'm trying to predict dB increment through my passive amplifier for cell phones.

The picture shows a section view of vorticity through the sound path when the wind blows into the narrow pipe.

I got static pressure plots using the probe 1 and 2, then converted into SPL vs. Frequency response.

The responses at two different probes showed that 20~20kHz sound amplitude decreased from the probe 1 to the probe 2.

It makes sense since the wind speed must reduce along the path due to wall friction.

I guess sound wave input is essential to see what I want, which is sound dB increase through my passive amplifier design.

Please give me a hand, XFlow god

Thank you,

Je pyo Hong

[Update]

I've changed the velocity input into a static pressure input with a group of sine waves.

The result visualizes sound waves in a volumetric view.

I could see the sound wave get noise through the pipe.

The problem is, the amplitude of the sound still reduces from Probe 2 to Probe 1. It seems like wall friction weakens the pressure along the pipe.

How can I literally amplify the sound using the passive amplifier?