Event Detail

Event Type: 
Applied Mathematics and Computation Seminar
Friday, April 24, 2020 - 12:00 to 12:50

Speaker Info

OSU Mechanical Engineering

This presentation will be given online by zoom, with the zoom link sent to the AMC seminar list. Participants interested in viewing should sign up for that list (see AMC Seminar website).

Although surgical site infection (SSI) rates are typically low (~2.2%), about 300,000 SSIs per annum are reported in the US with about 3% mortality rate. Squames, or tiny disk-shaped flakes of skin of about 4-20 micron diameter, 3-5 micron thickness and density of water, shed by surgical staff in an operating room (OR) can carry microbial skin-colonizing bacteria such as Staphylococcous auerus. It is hypothesized that warm-air blowers in combination with a blanket designed to prevent hypothermia during knee-surgeries, and the resultant turbulent, thermal plumes interacting with the downdraft of ventilation air in the OR, may potentially be responsible for dispersal of bacteria carrying squames to the surgical site and cause infection. A high-fidelity, predictive numerical technique, based on large-eddy simulation (LES) of the fluid flow within a realistic operating room environment together with Lagrangian tracking of about 3 million squame particles, is used to investigate this phenomenon. Numerical tests with and without the hot-air blower are conducted to isolate the effect of the rising plumes from warm-air blowers. In this talk, we will first introduce the problem of SSIs and their impact on the health-care system. A predictive numerical approach for turbulent flows utilizing arbitrary shaped, unstructured grids will be discussed next, together with modeling of transport of skin cells. Predictions will be analyzed to address the effect of hot-air blowers.