virtual simulation
Speaking of simulation, @Jonathan.JILESEN shared this nice demonstration of what he can do for modeling a sneeze against PPE:
He reports that in this example 140 particles made it behind the mask to the area of the nose and mouth, showing the mask is still needed. As designs progress, this capability is available for evaluation.
Activity
A little background on this: To better understand the effectiveness of Personal Protective Equipment (PPE) that is being developed and deployed we have developed a computational simulation based on SIMULIA PowerFLOW of a human sneeze. The sneeze event is based on published data including gas velocity as a function of time exiting the mouth as well as droplet particle size and distribution. The result is a realistic model of a sneeze event.
The attached video shows how the turbulent jet helps distribute the mucus particles through the air. The video also highlights the surfaces of the shielded individual that are being contaminated with a red/purple color.
The simulation also suggests small particles are entrained behind the shield coming into close proximity of the shielded individual. These simulations can provide valuable insight into the flow physics of sneezes which can be used to aid in making decisions about PPE. The simulations are computationally efficient allowing for rapid exploration of design space that could include shield length, width, the distance between individuals, for example.
Could your team help us model the flow in/out of the respirator?
We've been trying to build a face-mask without a check-valve to provide bidirectional protection. but the end of the breath can be problematic. The dead space infront of the mouth leaves CO2, but we also want to leave space for different face shapes.
I'm wondering if there's any sort of inlet geometry, nozzle shaping that would improve flow characteristics?
Edited by Matt Carney@mcarney Yes we could. Are you looking for just airflow or do you want us to track the levels of CO2? The simulations of the respirator that I already did was interesting to me because of the non-uniformity of the flow. Most of the air was going through the top part of the filter as I had the person breathing through their nose. I have flow profiles for sneezing and coughing but not for regular breathing yet.
Hi @mcarney Sure, please feel free to reach out to @Jonathan.JILESEN @gregory.laskowski We'll be super happy to help your team
@Jonathan.JILESEN @gregory.laskowski Great! breathing in/out with CO2 in particular would be great, but also just general flow to see utilization of the filter, and perhaps estimate if there is particulate accumulation in one part of the filter media.
Abishek can actually give you access to my files, he and Suchit already set us up to use 3DExperience Platform for our document control!
Hey Matt,
I do have access to your collab space but there are many versions on it. Can you please send the one you want for Jonathan as a STEP file please? PowerFLOW application is not part of the same cloud environment on the platform so it won't help Jonathan to gain access to the collab space. I think you sending the files directly will make for a more direct workflow :)
@abhishekbali (just for your reference) I agree, sorting through that web interface is a little clunky. Here's the part name for your reference: FM05-A001_TestFitFullFaceAssy.SLDASM
@Jonathan.JILESEN @gregory.laskowski here's a dropbox link, let me know if that works for you. https://www.dropbox.com/s/p7rd0p42t73lqd7/FM05-A001_TestFitFullFaceAssy.STEP?dl=0
mentioned in issue #40
