Thermal Modeling of the OSIRIS-REx Camera Suite

Daniel Alfred, University of Arizona

OSIRIS-REx Camera SuiteOSIRIS-Rex is an asteroid sample return mission, led by scientists at the University of Arizona, that will send a spacecraft to a near-Earth asteroid for the purpose of collecting a sample and returning it to Earth for testing and analysis. The purpose of the mission is to collect a sample from a carbonaceous asteroid, named Bennu, that contains organic matter representative of what was present during the formation of the solar system. We also hope to better understand the origin of objects like Bennu. There are several scientific instruments placed on the spacecraft to help accomplish this mission, including the OSIRIS-REx Camera Suite (OCAMS), developed by engineers and scientists at the University of Arizona. OCAMS is comprised of three different visible light cameras (MapCam, SamCam, and PolyCam) which will acquire images of Bennu at ranges from 2 million km to a few meters from the surface. OCAMS will characterize the surface and shape of the asteroid and help locate and take images of the sample site and sample acquisition.

Thermal models of each of the three OCAMS cameras for the OSIRIS-REx mission were developed in Thermal Desktop and solved with SINDA/FLUINT. Since these models needed to be incorporated into a system-level spacecraft thermal model along with all of the other OSIRIS-REx instrument thermal models, each model had a node count limit of roughly 100 nodes. They were developed largely from the ground up, using mostly Thermal Desktop primitives and user-defined nodes. They were initially compared with detailed and independently-developed finite element models of the OCAMS cameras, and then correlated to thermal test data attained from Thermal Balance tests performed with OCAMS flight-like hardware.

Click here to learn more about the OCAMS thermal modeling


flow regimes

Introduction to Two-phase Flow

September 24, 2-3pm MDT

This webinar introduces basic concepts in two-phase flow modeling including quality, void fraction, flow regimes, slip flow, pressure drops and accelerations, and heat transfer.

No knowledge of CRTech software is required. However, references to the corresponding FloCAD features will be made to assist users of that product.

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Introductory FloCAD Training

Class times: September 5, 10, and 12, 2019, 9:00 am to 12:00 pm MDT daily
Cost: no charge (attendees must have an active support contract)

CRTech will be hosting introductory training for FloCAD (Flow Modeling in Thermal Desktop). This is our standard FloCAD class previously hosted in a classroom environment and now restructured for an online teaching environment.

The class will introduce single-phase fluid modeling concepts and how to build fluid models within the FloCAD work environment. Topics covered include an introduction to fluid modeling components, geometric versus non-geometric modeling options, working with FloCAD Pipes, solution control, and an introduction to path and pipe libraries.

The class will be broken into three two- to three-hour sessions held over a 3 day period. The format will be online lecture and demonstration with opportunities to ask questions. Hands-on lab work will be provided to students to work on after each session. To gain the most from this class, students are encouraged to attend all three sessions.

Prerequisites: Attendees must have basic working knowledge of Thermal Desktop as many of its base features will not be covered in this class but their usage is required for FloCAD.

Eligibility Requirement: This class is a service to our customers. All attendees must have an active support contract. If you are unsure of your support status, please contact CRTech.

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