System Requirements


Operating System

  • 64 bit Windows 7, 8, or 10

Fortran Compiler

Since SINDA/FLUINT allows user logic and generates a unique executable each time it is run, you MUST have a copy of the correct compiler.

The following compiler is required:

Note: Only the Composer Edition of any version is required. The Professional or Cluster editions will also work, but those editions add features that are not required by SINDA/FLUINT.

Note:  Intel Parallel Studio XE 2011 Updates 0 through 9 contained a bug that causes SINDA to fail.   Only updates 10-13 work with SF6.0

Also see  Intel Visual Fortran System Requirements

The Intel compiler requires Microsoft Visual Studio or Visual Studio Shell (free) to be installed. Check the Intel system requirements to see which versions of Visual Studio are supported. If Visual Studio is not found on the computer, the installer will automatically install the shell version. No purchase of the Microsoft visual studio is required.

Evaluations: Please contact CRTech to learn how to evaluate CRTech software if you do not already have the Intel compiler.

Minimum Memory

  • 2GB (4GB recommended)

Thermal Desktop®, RadCAD®, and FloCAD®

Operating System

  • 64 bit Windows 7, 8, or 10

Required Software

  • SINDA/FLUINT, which is the solution engine
  • CAD Package: AutoCAD® 2013, 2014, 2015, 2016, 2017, and 2018
    Also see Autocad system requirements
  • Note: Thermal Desktop 6.0 is the last version that will support AutoCAD 2013 and 2014 

Minimum Memory

  • 8 GB


  • Discrete graphics card recommended, see Autodesk's website for certified graphics cards
  • Display resolution: 1024x768 minimum, 1280x1024 or finer with 100% font size recommended

TD Direct®

Required Software

dispersed vs. coalesced front

Tuesday, June 26, 2018, 1-2pm PT, 4-5pm ET

This webinar describes flat-front modeling, including where it is useful and how it works. A flat-front assumption is a specialized two-phase flow method that is particularly useful in the priming (filling or re-filling with liquid) of gas-filled or evacuated lines. It also finds use in simulating the gas purging of liquid-filled lines, and in modeling vertical large-diameter piping.

Prerequisites: It is helpful to have a background in two-phase flow, and to have some previous experience with FloCAD Pipes.

Register here for this webinar

FloCAD model of a loop heat pipe

Since a significant portion of LHPs consists of simple tubing, they are more flexible and easier to integrate into thermal structures than their traditional linear cousins: constant conductance and variable conductance heat pipes (CCHPs, VCHPs). LHPs are also less constrained by orientation and able to transport more power. LHPs have been used successfully in many applications, and have become a proven tool for spacecraft thermal control systems.

However, LHPs are not simple, neither in the details of their evaporator and compensation chamber (CC) structures nor in their surprising range of behaviors. Furthermore, there are uncertainties in their performance that must be treated with safety factors and bracketing methods for design verification.

Fortunately, some of the authors of CRTech fluid analysis tools also happened to have been involved in the early days of LHP technology development, so it is no accident that Thermal Desktop ("TD") and FloCAD have the unique capabilities necessary to model LHPs. Some features are useful at a system level analysis (including preliminary design), and others are necessary to achieve a detailed level of simulation (transients, off-design, condenser gradients).

CRTech is offering a four-part webinar series on LHPs and approaches to modeling them. Each webinar is designed to be attended in the order they were presented. While the first webinar presumes little knowledge of LHPs or their analysis, for the last three webinars you are presumed to have a basic knowledge TD/FloCAD two-phase modeling.

Part 1 provides an overview of LHP operation and unique characteristics
Part 2 introduces system-level modeling of LHPs using TD/FloCAD.
Part 3 covers an important aspect of getting the right answers: back-conduction and core state variability.
Part 4 covers detailed modeling of LHPs in TD/FloCAD such that transient operations such as start-up, gravity assist, and thermostatic control can be simulated.