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19th International Icing Course (Online), Jan 2021, Canada

Posted By: Jenny H. - Pelletier
Date:Wed, 12 May 2021, 2:44 a.m.

Canada, October 12, 2021

This condensed online course will show how modern fully 3D in-
flight icing analyses are based on highly verified and
validated physical models, as opposed to legacy 2D and 2.5D
codes that are simply calibrated against icing tunnel data.
The course will link in a unique fashion causes, effects,
analysis methodologies, ice protection systems design, type
certification rules and workflow, and lessons learned.



For an aircraft, rotorcraft or jet engine to obtain a type
design certification, it must be demonstrated that it can
sustain safe flight into known or inadvertent icing
conditions. The icing certification process involves CFD
(Computational Fluid Dynamics) analyses, wind and icing tunnel
testing (EFD: Experimental Fluid Dynamics), all considered
“simulation”, and final demonstration of compliance through
Flight Testing in Natural Icing (FFD: Flight Fluid Dynamics).
Modern 3D CFD-Icing methods such as FENSAP-ICE, working as a
direct extension of CFD-Aero technologies, have become an
indispensable, if not a primary tool, in the certification
process. They are rapidly replacing 2D and 2.5D methods
(airfoils don’t fly; aircraft do). They enable analyzing the
aircraft (fuselage, wing, engines, nacelles, cockpit windows,
sensors, probes, etc.) as a system and not as an assemblage of
isolated components. The judicial integration of CFD-EFD
simulation tools provides a cost-effective aid-to-design-and-
to-certification, when made part of a well-structured
compliance plan. CbA (Certification-by-Analysis) being a
current “hot” subject; this course puts it into real practice,
providing efficient tools and showing examples of capabilities
and limitations.

The course will show how modern 3D icing codes are based on
highly validated physical models (Scientific VVV) as opposed
to a Catch-22 calibration of codes against icing tunnels to
yield heuristic models. The course will also show how Reduced
Order Models can make fully-3D calculations inexpensive
(yielding 3D CFD with 10-20 million points + impingement +
icing + performance in 1/100th of a second, after the
calculation of an appropriate number of “snapshots”: this is
even faster than 2D panel methods calibrated codes!) and
enable rapid identification of aerodynamic and thermodynamic
critical points in a structured way and not a heuristic one.
By inclusion of icing requirements at the aerodynamic design
stage, a more comprehensive exploration of the combined
aerodynamics/icing envelopes, optimized IPS design, and
focused/reduced wind tunnels, icing tunnels and flight tests.
The end result is a faster design, faster testing, faster
natural icing campaign, and a safer aircraft that is easier to

This course is structured to be of equal interest to
aerodynamicists, icing, environmental systems and flight
simulation engineers, regulators and Designated Engineering
Representatives. Detailed knowledge of CFD is not necessary.

The lectures cover the major aspects of in-flight icing
simulation, ice protection systems, handling quality issues.
The instructors bring an amalgam of knowledge, as scientists
who have produced codes in current use and engineers with
certification experience, along with cost-effective simulation
methods widely used internationally for certification of
aircraft for flight into known icing.

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