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


Choking and High-speed Flow

Tuesday December 17th, 2pm MST

When flow velocities get big, things gets interesting. Above Mach=0.1, the bulk fluid "sees" a wall that is warmer than the structural temperature due to deceleration within the boundary layer. Above Mach=0.3, kinetic energy changes cease to be negligible. And of course, nothing moves faster than Mach=1.0 for internal flow. When you also add in changes in flow area, or changes in phase ... well, let's just say that doesn't simplify anything.

This webinar will introduce you to the phenomena involved, with a focus on the FloCAD modeling parameters available and their associated correlations and assumptions.

Click here to register

Turbomachinery and Rotating Passages (Secondary Flows)

Thursday December 19th, 2pm MST

Are turbomachines a component in your system, and you'd like to treat them as a "black box"?

Or are they the focus of your work, and the cycle is just a boundary condition to you?

Either way, this webinar will have something to offer you. Each type of turbomachine will be covered: pumps and fans, positive and variable displacement compressors, and turbines (whether gas or hydraulic). Methods for modeling systems like turbochargers and turbopumps will be introduced. Tools for handling spinning flow passages and rotating cavities will be presented.

Click here to register

Starting in 2020, we will begin offering Introduction to Thermal Desktop and Introduction to RadCAD as either in-person training or online training, alternating between online and in-person every three months. The training uses lectures and demonstrations to introduce you to basic Thermal Desktop and RadCAD usage. Hands-on tutorials provide practice building models and interpreting results (tutorials are completed by students outside of the online class time).
The next training class will be an online format in January 2020:
  • Introduction to Thermal Desktop (and SINDA) - A three-part series on January 14, 16, and 21 from 9am to 12pm, Mountain time
  • Introduction to RadCAD - January 23 from 9am to 12pm, Mountain time
For up-to-date schedules, fees, and policies, visit our Product Training page. To register for the class above, complete our registration form and select "Online" for the Training Format.
If you are interested in product training for your company based on your schedule, please contact us to obtain a quote for training between 8-12 attendees. We can come to your facility or the lectures can be presented online. Descriptions of the available classes can be found in our course catalog.
To keep up with our training opportunities, take a look at our new Events and Training Calendar.