Thunderhead Engineering Forum

Public Forum => PyroSim => Topic started by: nsdmr on May 17, 2013, 12:04:27 am

Title: adiabatic vs inert surfaces
Post by: nsdmr on May 17, 2013, 12:04:27 am
Hi folk, i know basic diffirents between adi and inert surfaces but what about slip effect? we can control in adi surfaces yes. how can we control inert surface for free-slip condition

Title: Re: adiabatic vs inert surfaces
Post by: Charlie Thornton on May 17, 2013, 09:30:14 am
It's not clear to me why we have this option for adiabatic surfaces but not for other types of solid surfaces. Based on my reading of the FDS 5 User Guide, Section 9.6 "Tangential Velocity Boundary Conditions at Solid Surfaces", it looks like the NO_SLIP, FREE_SLIP, and ROUGHNESS parameters should be available on any solid surf.

Even though these parameters are not explicitly supported by PyroSim, surfaces offer a way to enter additional parameters using the Advanced panel. For example, to set a surface to use the free-slip boundary condition, open the Advanced tab on any solid surface and add a table entry with [FREE_SLIP, .TRUE.] to simulate a free-slip condition. Don't forget the "." on either side of TRUE. Advanced values are copied directly into the FDS input file and the dots expected by FDS's fortran-based parser.