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LowSpeed Flows
Low speed flows are characterized by a large or infinite
sound speed, relative to the fluid velocities in the system (i.e., small
Mach number). Most of the physical systems of common interest are of this
type. The challenge in these types of flow is that changes locally can
influence all other aspects of the flow almost instantaneously. Techniques
for treating these flows have been in development since the early
days of T3.
This is a new reactive flow algorithm under development in T3 for simulating
a variety of hydrodynamic phenomena ranging from lowspeed incompressible
flows to shockwave hydrodynamics. Incylinder combustion of gasoline
and diesel engines, external vehicle aerodynamics, underhood cooling,
vehicle air conditioning, and highvelocity impact simulations are some
of the applications where this algorithm may be usefully employed. This
is the first threedimensional T3 algorithm to have a fully implicit
and coupled solution to the NavierStokes equations, thereby eliminating
the traditional separation of the Lagrangian and rezone phases. The flow
solver employs an implicit finitevolume technique that performs surface
integrals in parallel loops over connections associated with the two terminus
nodes [Mavriplis, 1995]. A continuous transition between
explicit and implicit advection is employed that is secondorder accurate
for Courant numbers less than unity and is monotone and unconditionally
stable (a 3D extension of the scheme of Collins, et al. [Collins
et al, 1995]). Other unique features of the algorithm are an accurate
treatment of the diffusion terms and an accurate gradient limiter for
an arbitrary number of nearest neighbors associated with a node.
Los Alamos Lowspeed Flows Projects
All of the filled circles are linkable projects.
All of the empty circles are navigational guides.
 Low gravity flows
 Modeling Surface Tension
 All speed numerics
This is from "The Legacy and Future of
CFD at Los Alamos" (LAUR#LAUR1426)(365Kb pdf file)


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