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SIMOC papers presented at ICES 2025

Fabio, Griffin, and Lucien at ICES 2025 with a poster about SIMOC-based research

The International Conference on Environmental Systems (ICES) in Prague offered a great platform to showcase recent achievements in SIMOC and SAM. Griffin Hentzen presented a paper written by Dr. James Knox, NASA veteran, who with the SAM team is designing an advanced CO2 scrubber for integration into the new SAM Experimental Air Revitalization Laborator (EARL), currently in construction. This scrubber will close the air quality management loop in the Environmental Control and Life Support System (ECLSS) of SAM, further increasing mission fidelity during analog inclusions.

Griffin also presented a paper on behalf of Dr. Cameron Smith on the first prototype of a portable, pressurized, emergency shelter for deployment on Mars.

SAM has since the spring of 2024 been working with the Technical University of Munich (TUM), Germany, under Dr. Gisela Detrell, where graduate student Fabio Schäfer is designing a large scale photobioreactor to be installed in the new SAM EARL facility. Fabio presented a poster on how this system will support future bioregenerative atmosphere revitalization research. This project is the first to implement a photobioreactor (algae-based CO2 sequestration) of this scale in an analog facility, opening a multitude of opportunities and research questions to be studied at SAM.

Also from TUM, Lucien Volk shared his progress on a photobioreactor simulation model built in SIMOC. The capability to simulate realistic photobioreactor behavior is important to design robust hybrid and bioregenerative life support systems for future missions to space. This previous article shares details about his work.

As always, ICES was a great opportunity for the SIMOC-SAM and TUM working groups to gather and connect with the greater ECLSS community.

Visit the SIMOC and SAM Publications page to learn more …

By |2025-08-28T18:03:47-07:00July 17th, 2025|Categories: Publications|0 Comments

ASU’s Interplanetary Initiative features SIMOC

SIMOC at ASU II

Arizona State University’s Interplanetary Initiative, the same that supported the launch of SIMOC in 2017-18, is featuring SIMOC is a new interactive, educational “BIG IDEAS” question “How will the first humans on Mars work together to survive?”

Enjoy the three featured segments, “How can we sustain healthy communities on Mars?”, “Why we can’t stop dreaming about the Red Planet”, and “Can your students build a model for off-planet survival?”

Learn more …

By |2025-05-15T23:55:31-07:00May 15th, 2025|Categories: In the news|0 Comments

Microalgae and Photobioreactors for SIMOC

A mass flow diagram, Lucien Volk, TUM, Germany
Figure: Proposed ECLSS concept for DIANA, adapted for simulation in SIMOC.

Microalgae and Photobioreactors for SIMOC
by Lucien Volk, Masters student candidate
Technical University at Munich (TUM), Munich, Germany

Future space exploration missions aim to venture to the Moon, Mars and beyond. It is the current consensus in the ECLSS community, that these long durations missions will require hybrid and biological life support systems for these missions to be realistically feasible. Microalgae grown in photobioreactors seems to be a promising component part of these necessary life support system architectures since they can absorb the CO2 human’s breath out while producing the vital O2. Additionally, they can potentially provide several other services such as food production and wastewater treatment. The goal of the research performed at the Technical University of Munich (TUM) was to implement a microalgae photobioreactor in SIMOC to enhance its capabilities and study the impact of photobioreactors on a life support system architecture.

The photobioreactor implemented was based on the research work performed under the “PBR@LSR” project at the University of Stuttgart [1]. SIMOC was able to reproduce the gas characteristics observed in the experiment. With regards to food production, the research at TUM concluded that a microalgae photobioreactor operated in a semi-continuous mode (algae is grown continuously and only partially harvested) is likely to produce more biomass than a photobioreactor operated in batch mode (algae is fully harvested every cycle). However, required photobioreactor volume heavily depends on whether CO2 is absorbed, O2 produced, or food provided and can be up to 500L per person. Therefore, a microalgae photobioreactor is often geared towards a specific task.
Finally, the microalgae photobioreactor was implemented as part of a proposed Moon base, specifically the base concept “DIANA” of Astraeus e.V. [2]. Here, SIMOC revealed that a photobioreactor could contribute to a stable ECLSS system providing 30g/d of food per crewmember, producing parts of the necessary O2 and processing parts of the CO2. While it was shown that microalgae photobioreactors could be implemented in SIMOC, several improvements must be made to said model to be more precise and usable before it can become an official component in SIMOC.

The research work performed with regards to microalgae photobioreactors and SIMOC will be presented as a poster at ICES 2025, pending approval of the abstract.

Sources
[1] H. Helisch et al., “High density long-term cultivation of Chlorella vulgaris SAG 211-12 in a novel microgravity-capable membrane raceway photobioreactor for future bioregenerative life support in SPACE,” Life Science in Space Research, pp. 91–107, 2019, ISSN: 2214-5524. DOI: https://doi.org/10.1016/j.lssr.2019.08.001.

[2] D. Acker et al., “DIANA-Dedicated Infrastructure and Architecture for Near-Earth Astronautics,” 51st International Conference on Environmental Systems, 2022.

By |2025-08-28T18:03:16-07:00April 1st, 2025|Categories: Education|0 Comments

Scalable, Interactive Model of an Off-World Community at NSTA

by Meridith Greythorne and Kai Staats
for the National Science Teachers Association (NSTA)

Abstract
The Scalable, Interactive Model of an Off-World Community (SIMOC) is a computer simulation of a human habitat on Mars. Built upon decades of NASA research and authentic science processes, SIMOC is both a research-grade simulation and an engaging web-based tool for science education. Users access an intuitive web interface to select mission duration, inhabitants and life support modules, crew quarters and greenhouse sizes, food rations and cultivar seeds, and energy production and storage systems.

SIMOC engages citizen scientists and learners of all ages in the design of long-duration other-world habitats (with an emphasis on Mars), where the balance between mechanical and plant-based life support will be crucial. For the past three years, SIMOC has enjoyed expanding engagement in virtual and physical classrooms, available for free via the National Geographic Education resource library or local installation.

Using a Next Generation Science Standards-aligned curriculum, educators have explored creative applications of SIMOC, from single class time simulations to Mars habitats built from cardboard boxes with live carbon dioxide sensors; from essays on the challenges of human space exploration to full semester design and fabrication of habitats complete with student-built mock-ups in miniature.

Read the full article …

By |2024-12-26T21:09:58-07:00December 23rd, 2024|Categories: Publications|0 Comments

SIMOC Live at the Arizona Science Center

SIMOC at the Arizona Science Center

Do you have what it takes to live on Mars?

The Arizona Science Center in downtown Phoenix, Arizona proudly welcomes SIMOC to the My Digital World, Level 3 exhibit floor.

The exhibit, which opened mid November 2024 enables guests to test a Mars habitat of their own design. Guests are tasked with configuring essential components for survival, including carefully calculated food rations, efficient life support systems, reliable solar panels and batteries, and comfortable crew quarters. They must also design a greenhouse with thoughtfully selected plant varieties to purify the air and produce sustenance. Once these elements are set, guests activate the simulation model to assess whether their astronauts can thrive—or if critical adjustments are still needed to secure their survival.

By |2025-05-29T17:28:52-07:00November 13th, 2024|Categories: Education|0 Comments

As the summer unfolds …

This summer is seeing many exciting updates for SIMOC, with an in depth story for each coming soon!

  • The SIMOC Live development team continue to improve the code and test the platform, with the original and new 64-bit Raspberry Pi Zeros tested and functional.
      
  • Several new Adafruit sensors are being tested, including light intensity, a microphone, and IR sensor for proximity awareness. The goal is to give SIMOC Live the ability to capture movement inside a habitat such that the approximate location of the crew members can be correlated to CO2 levels in each room, but without video capture or individual identity tracking.
      
  • An Adafruit GPS and accelerometer are being tested as well, looking to a future in which SIMOC Live may be redesigned as a hand-held unit or deployed in a pressure suit during EVAs.
      
  • The Arizona Science Center is installing an interactive SIMOC Live kiosk! More to come, soon!
      
  • The Analog Astronaut Conference has accepted our proposal for SIMOC Live to be deployed in each of the nine habitats world-wide as a ELCSS monitoring system. While each habitat already has some level of air quality monitoring, the installation of SIMOC Live across the entire domain will provide a singular data format and seamless, (delayed) real-time monitoring from the central Mission Control Center.
      
  • Ezio and Franco will venture to Poland to install SIMOC Live at the famous Lunares habitat analog for their upcoming mission for the month of September. This will be a proof of concept for remote monitoring of a habitat beyond SAM.  
  • The National Science Teachers Association will soon publish a feature article about SIMOC—stay tuned!

Again, each of the above will be expanded into individual photo essays … stay tuned!

By |2024-07-30T17:41:13-07:00July 30th, 2024|Categories: Research & Development|0 Comments

SIMOC papers presented at ICES 2024

The SIMOC team presented three papers at the International Conference on Environmental Systems (ICES), July July 21-25, 2024, Louisville, Kentucky

Model and Design of a Fully Integrated Bioregenerative Life Support System using an Agent-based Model of a Physico-chemical and Bioregenerative ECLSS

by Sean Gellenbeck with Joel Cuello, Barry Pryor, Chuck Gerba, and Kai Staats; ICES 2024, Louisville, Kentucky

“This [is] the third part of this research project following that discussed in ICES-2023-274. This is the complete modeling and design of a FI-BLSS. Initial experiments were conducted to inform and validate a tool called Scalable, Interactive Model of an Off-world Community (SIMOC) designed to use agent-based modeling to analyze habitat life support systems. Following these experiments, a full system design was developed using SIMOC.”

Visit the SIMOC and SAM Publications page to learn more …

By |2025-08-28T15:46:05-07:00July 25th, 2024|Categories: Publications|0 Comments

SIMOC Live a success!

SIMOC Live ad hoc mesh network sensor node installed in the SAM Test Module

The new SIMOC Live version 2.0 now incorporates an ad hoc, mesh network, with full data redundancy across all nodes. Sensor arrays built on a Raspberry Pi Zero and Adafruit sensors captured data in each of the four primary nodes of SAM: lung, Test Module, Engineering Bay, and Crew Quarters.

More photos, data, and a complete story coming soon!

For now, visit samb2.space/blog

By |2024-04-24T05:22:18-07:00March 15th, 2024|Categories: Research & Development|0 Comments

SIMOC Live version 2.0 at SAM

Lead developer of SIMOC Ezio Melotti arrive to SAM at Biosphere 2 mid February. He receive Christopher Murtagh, Systems Architect and colleague of Kai Staats for more than twenty years. Together they built the point-to-point wireless feed from the SAM Operations Center to the Mars yard and into the SAM habitat analog. Chris built a new version of the SAM light-travel time delayed email server while Ezio continued to fine tune the form and function of the latest build of SIMOC Live and its sensor array.

Chris departed and Franco Carbognani arrived, a Sr. Engineer at the VIRGO gravitational wave observatory to work with Ezio on the SIMOC Live ad hoc, full mesh sensor array. This is a vast improvement on the version installed in SAM for the first two crew in that a unique sensor array will now be placed in the SAM lung, Test Module (green house), engineering bay, and crew quarters for a 4x increase in data generation and fidelity in air quality analysis.

To learn more, visit SAM

By |2024-03-06T07:49:03-07:00March 1st, 2024|Categories: Research & Development|0 Comments

SIMOC integrated into Biosphere 2 K-12 app

SIMOC K-12 application at Biosphere 2

The Biosphere 2 K-12 app provides an accessible guide for students and their teachers to explore this advanced scientific research facility, the worlds largest closed system with everything needed to support human life. By the end of your experience, you’ll be prepared to design and build your own biosphere using a computer model using the SIMOC application which includes a comprehensive model of original 1991-93 and 1994 sealed experiments with 8 and 7 crew members, respectively.

Download the app for iPhone | Download the app for Android

By |2025-05-29T14:25:57-07:00February 12th, 2024|Categories: Education|0 Comments
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