Fwd: Presenting at NASA Advanced Modeling & Simulation (AMS) Seminar this Thursday

[Santiago Marquez Damian]

Colegas, reenvío invitación para el seminario que dará Federico Zabaleta en la NASA Advanced Supercomputing (NAS) Division. Federico es egresado de FI-UNLP y tuvo como director doctoral a Fabián Bombardelli (ver más abajo).

Saludos

---------- Forwarded message ---------
From: Federico Zabaleta <fzab...@stanford.edu>
Date: Mon, Jan 26, 2026 at 3:49 PM
Subject: Presenting at NASA Advanced Modeling & Simulation (AMS) Seminar this Thursday
To:

Hi everyone,

I wanted to let you know that I'll be presenting at the NASA AMS Seminar series this Thursday. If you're interested and available, you're welcome to join!

All the details are below. 

Best,

Federico

 

Advanced Modeling & Simulation (AMS) Seminar Series -  https://www.nas.nasa.gov/pubs/ams.html

 

SPEAKER: Federico Zabaleta, Center for Turbulence Research, Stanford University, Stanford, CA

TOPIC: Large-Eddy Simulations of Conjugate Heat Transfer over Iced Surfaces

WHEN: 9:00 AM PST, Thursday, January 29^th, 2026

WHERE: Building N258, Auditorium (Rm. 127), NASA Ames Research Center, Moffett Field, CA

 

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ABSTRACT

The accurate prediction of aircraft icing remains a critical challenge for flight safety and certification. While various ice accretion codes are currently in use, they frequently exhibit significant uncertainty, particularly in glaze ice conditions. A major contributor to this uncertainty is the lack of high-fidelity heat transfer predictions, which fundamentally govern the local freezing rates and resulting ice morphology. Traditional modeling approaches typically simplify the accretion physics, relying on isothermal wall assumptions and one-dimensional conduction models that fail to capture the complex thermodynamics of realistic ice roughness. This talk presents a high-fidelity, multi-physics framework that integrates wall-modeled large-eddy simulation (WMLES), Lagrangian droplet tracking, and unsteady conjugate heat transfer (CHT) to resolve coupled fluid-solid thermal interactions.

Our results reveal that solid thermal conduction within the ice layer is a critical, often overlooked mechanism that drives multi-dimensional heat transfer, fundamentally altering local heat flux distributions and even inducing heat flux reversal at roughness peaks. We further demonstrate that traditional isothermal wall assumptions significantly overpredict the Stanton number distribution by failing to account for temperature variations within roughness elements. Furthermore, the large roughness-to-boundary-layer ratios observed disrupt outer-layer similarity, rendering standard equivalent sand-grain models inadequate for predicting wall-shear stress and heat transfer in these regimes. By performing high-fidelity simulations of conjugate heat transfer over iced surfaces, we demonstrate that the effects of solid conduction are essential and must be accounted for in next-generation icing prediction models.

Boundary layer transition over ice-characterized roughness. Iso-surfaces of temperature (T = 299 K) are colored by local velocity magnitude, resolving the interaction between complex surface topology and turbulent flow.

SPEAKER

Federico Zabaleta is a Postdoctoral Fellow at the Center for Turbulence Research (CTR) at Stanford University, where he leads the development of high-fidelity Large Eddy Simulations (LES) for aircraft icing. Working under the direction of Professor Parviz Moin, his research focuses on integrating multi-physics frameworks to improve the predictive accuracy of icing models for safety and certification. Federico holds a BSc in Civil and Hydraulic Engineering from the National University of La Plata, Argentina, and earned both his MSc and PhD from the University of California, Davis. His doctoral research specialized in the development of numerical techniques for simulating air entrainment in complex free-surface flows.

__________________________________________________________

 

Jared Duensing Branch Chief Computational Aerosciences Branch (Code TNA) NASA Ames Research Center  Mail Stop 258-2 Moffett Field, CA 94035  M: 256.930.1402 O: 650.604.4527 jared.c....@nasa.gov

 

--

Dr. Ing. Santiago MÁRQUEZ DAMIÁN

Investigador Adjunto - Prof. Adjunto Interino UTN
CIMEC -  CONICET/UNL - Of. 32 
Tel: 54-342-4511370 Int. 7032 
Colectora Ruta Nac. 168 / Paraje El Pozo 
(3000) Santa Fe - Argentina.
http://www.cimec.org.ar