C&R Technologies, Inc. ("CRTech") was created in 1991 by Brent Cullimore and Steve Ring. Having supported the development of SINDA/FLUINT since the early 80's, Steve and Brent took on the task of transitioning SINDA/FLUINT from a NASA-developed code to a commercial product. They began by updating and greatly enhancing SINDA/FLUINT and by providing the first-ever graphical interface, SinapsPlus® (predecessor to Sinaps®). From there the growing team continued with the development of RadCAD®, a replacement for the long-time standard thermal radiation modeling package TRASYS. Over the years, improvements and software suite expansions continued with the introduction of Thermal Desktop®, FloCAD® and TD Direct®, always with the goal of enabling fellow thermal and fluids engineers.

As a team of thermal, fluid, and chemical engineers, we understand the needs of our customers and have the knowledge to create software to meet these needs. The result is that CRTech is a world-wide powerhouse in thermal and fluids analysis software. We are not an all-in-one analysis solution for everything from stress to dynamics because we are unwilling to make the necessary compromises. We do one thing, and we do it very well.

Our customer base of over 5000 users in over 40 countries spans a broad spectrum of industries. We are the authors of the codes we sell and support commercially with personnel devoted to customer support, marketing, sales, training, and consulting.

We know what you need, so we produce tools unique to our world.

Our Core Products are:

There may be times that you are not able to purchase our software, learn how to use it, and solve your problem within your budget and time constraints. CRTech can solve this dilemma for you. We offer a full analysis consulting service for just this problem.

We also provide training in the use of all our products. See the Training page for a description of future and past courses.

Our numerous clients span such diverse industries as aerospace, aircraft manufacturers, petrochemical, electronics, automotive, energy, medical, and others:

Air Force Institute of Technology


ATA Engineering

Ball Aerospace

Blue Origin


Brigham Young University



German Aerospace Center

Embry Riddle

General Motors


Harris Corporation

Hokkaido University

Instituto Nacional de Pesquisas Espaciais



Johns Hopkins University

L-3 Communications

Lockheed Martin


MIT Lincoln Laboratory


Montana State


Naval Research Laboratory

NEC Corporation

New Mexico State University

Northrop Grumman

Nuclear Waste Partnership



Pennsylvania State University


Southwest Research Institute

Space Systems Loral


Thales Alenia Spazio

The Aerospace Corporation

UC Berkeley


United Launch Alliance

University of Arizona

University of Colorado

University of Nagoya

US Airforce

US Army

Utah State University

Virgin Galactic


FloCAD online training

Class times: May 2 & 4 from 10am to 2pm MT

Cost: $425

This online class will provide an introduction to fluid modeling components within FloCAD. The class will be held over a 2-day period, with daily sessions running approximately 4 hours each. The class uses a mixture of lecture, demonstrations, and self-paced tutorials to allow attendees to practice building fluid system models and interpreting results. The presentations will comprise 2 - 3 hours of each session, and the instructor will be available during the remainder of the time for questions during tutorials. Attendees must have basic working knowledge of SINDA and Thermal Desktop as these topics will not be covered but their usage is required for FloCAD.

Register here

Thermal Desktop, RadCAD, and TD Direct in-class training

Date: April 25-28, 2017, 8:00 a.m. to 5:00 p.m., daily
Location: Lakewood, CO

CRTech will be hosting introductory training for Thermal Desktop, RadCAD and TD Direct. Lecture and hands-on tutorials introduce attendees to basic Thermal Desktop and RadCAD usage and allow practice building models and interpreting results. The class will also introduce students to SpaceClaim direct modeling CAD interface and advanced meshing tools in TD Direct.

Daily Schedule

Day 1 and 2: Introduction to SINDA and Thermal Desktop
Day 3: Introduction to RadCAD
Day 4: Introduction to TD Direct

To learn more about this class and to register, visit our Training Page.

Anode and cathode of a flow battery

Using Sinaps? It is not too soon to get started with TD/FloCAD!

This webinar describes the process for converting from Sinaps to Thermal Desktop (TD) and FloCAD. This process includes using an exporter which works with Version 6.0 of the CRTech tool suite (expected to be released in May of 2017).

Come learn about the basics of TD/FloCAD, including many compelling features not available in Sinaps. The webinar will also cover how to manage the transition period, during which you may be using both programs simultaneously. This is also a chance to ask questions. 

If you missed this webinar, please contact us for the presentation material and recording.