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


Reacting Flows

Tuesday May 5th, 2pm MT (1pm PT, 4pm ET)

Reacting Flows is a capability that allows FloCAD to simulate fuel reformers, deal with the electrochemistry of flow batteries, predict combustion reactions in gas generations, and work with ionized and dissociated gases.

This webinar will explain how to use a working fluid as a reactant. It will also detail various options for determining reaction rates such as equilibrium, finite rate with stoichiometric coefficients, and percent complete based on inflowing reagents. Example applications are summarized.

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Dissolved Gases

Thursday May 7th, 2pm MT (1pm PT, 4pm ET)

When vapor meets liquid, it can condense. When gas (NCG) meets liquid, it can dissolve. When there is too much gas in the liquid, it can either evolve slowly at a wall or at the surface ... or it can come out explosively.

Whether your interests are environmental control, liquid propulsion, fire retardant delivery, or beer, this webinar offers a rare glimpse into an advanced modeling topic.

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