is a program that allows the user to quickly build, analyze, and
postprocess sophisticated thermal models taking advantage of lumped parameter, finite difference and finite element modeling methods.
Thermal Desktop offers the thermal engineer
full access to CAD-based geometry and CAD model building methods
without expecting the thermal engineer to be a CAD expert and without
compromising the unique aspects of thermal design analysis.
Thermal Desktop allows the user build a thermal model in a CAD envrionment. Using CAD geometry and user definable material databases, Thermal Desktop automatically generates necessary capacitance and conductance inputs which are automatically formatted and seemlessly sent to SINDA/FLUINT, C&R Technologies' thermal/fluid solution engine. Model results are passed directly back to Thermal Desktop for postprocessing, plotting and evaluation.
To provide a complete softare solution, Thermal Desktop has two add-on modules. The RadCAD® module calculates thermal radiation
exchange factors and orbital heating rates. Our second module FloCAD® generates flow networks and calculates
convective heat transfer factors. RadCAD and FloCAD are licensed separately separately from Thermal Desktop allowing the user to tailor the software capabilities to optimally meet analysis needs. RadCAD can be purchased and licensed without Thermal Desktop.
is available as a stand-alone, PC based, CAD program or as an AutoCAD® extension
application. Powerful CAD techniques for generating geometry can
be used for generating thermal models. Custom pull-down menus, toolbars,
and dialog forms permit the construction and analysis of thermal
models directly within the AutoCAD environment. Thermal Desktop
require some knowledge of general CAD techniques.
The user is provided with several tools to expedite the model building process, such as
Creating thermal surfaces from Autocad surfaces
Meshing Autocad surfaces, regions or solids
The ability to snap thermal surfaces to imported geometry
Importing meshes from other software products
Sample Screen (click to enlarge)
contains a set of custom surface types that combine the features
of CAD with the familiarity and convenience of TSS/TRASYS/NEVADA
type surfaces. True conic surfaces can be created with multiple
nodal breakdowns. These special surfaces contain grip points that
can be selected to directly modify the surface geometry. The grip
points in conjunction with snap features enable a new level of CAD-integrated
can analyze thermal models consisting of 3D faces, regular MxN meshes,
and arbitrary polyface meshes. These surfaces may be created directly,
or by using various mesh generation commands such as surfaces of
revolution, ruled surfaces, and edge defined patches. Thermal Desktop
is not limited to just conic surfaces like many other thermal programs.
Thermal Desktop can also import, display, and analyze existing TRASYS,
TSS, NEVADA, IDEAS FEM, FEMAP and NASTRAN models.
Native CAD Model Building Methods
engineer is familiar with CAD-based drawing methods such as revolving
curves, Boolean operations, ruling, etc., they may used to generate
geometry directly in Thermal Desktop. These geometric surfaces may
be used directly in the radiation model, or these surfaces (in addition
to arbitrary construction lines, arcs, and points) may be used as
scaffolding to which RadCAD surfaces can be snapped.
Thermal Desktop Surfaces
TRASYS, Thermal Desktop offers a list of geometric surfaces such
as cones, cylinders, disks, rectangles, spheres, and paraboloids
that can be used to generate geometric models using basic dimensions
such as length, radius, etc.
these surfaces can be input using specific dimensions, the user
may also stretch, shrink, rotate, etc. these surfaces directly on
the screen via the mouse-selected "grip points
example, the mouse grip points of a cone are shown here.
point changes a different aspect of the cone as the mouse is moved.
grip points are a
key means by which Thermal Desktop surfaces can
be used to "snap" onto more complicated CAD drawings without using
those drawings directly as the radiation model.
Existing or Imported CAD Drawings
3D CAD drawings, whether imported or native, can be used to help
develop a Thermal Desktop model. There are several ways to exploit
such a drawing. First, all or part of the drawing can be used directly
as part of the thermal model by selecting surfaces and assigning
them Thermal Desktop data such as node and property information.
the drawing can be used indirectly as scaffolding to which Thermal
Desktop surfaces can be snapped. For example, the user can select
key dimensional points on the drawing, drag an appropriate Thermal
Desktop surface over to it, and using grip points snap the Thermal
Desktop surface onto the highlighted "gravity" points on the drawing.
The underlying CAD drawing (or at least those parts not used in
the RadCAD model) can then be left as they are, discarded, or perhaps
hidden on another (temporarily) invisible layer. Thus, an appropriate
radiation model can be rapidly built without the thermal engineer
having to even know the exact underlying dimensions. If the design
changes, the drawing can be reimported and the Thermal Desktop model
can be stretched or shrunk as needed to fit the new dimensions.
Desktop allows the user to take an existing structural model from
NASTRAN, IDEAS, or FEMAP and to use it to construct a thermal model.
Thermophysical Property Databases and Aliases
The property databases files store the thermophysical and optical properties. A number of options are available for properties including: temperature dependence; pressure dependence for conductivity; angular dependence for optical properties; phase change; effective emissivity for MLI; and ablation for non-charring ablation and sublimation. The user may opt to change the property databases from one case to another to examine the effects of property degradation (end-of-life), perhaps.
Property aliases allow the user to specify a name linked to a property. The alias name is used in place of a property and points the property in the database. The property used in a solution can be changed by changing the property associated with the alias. As an example, the alias name ‘Insulation’ may be used in a model for all instances of the insulation; the material referenced by the alias can be easily changed from polystyrene to glass fiber if material trades are being performed or if the design dictates the change in material.
Set Manager organizes conduction generation, radiation analysis,
fluid flow network generation, SINDA execution, and post processing
under a single one-click operation. Multiple cases may be defined
and executed sequentially, automating and simplifying large analysis
case set manager also allows access to SINDA/FLUINT's Advance
Design modules for design optimization, test correlation and
The model browser allows access to all features of the model in a tree format. From the model browser, the user may view network hierarchies from multiple points of view, edit and delete network objects, plot results, and review results and results summaries. The model browser is an extremely powerful tool allowing access to objects that may not be visible in the graphics area.
is designed as a parametric design tool. Input fields for surface
parameters, assembly positing, optical and material properties,
network elements, and orbital data will accept numerical values
or expressions using arbitrary user-defined variables. Parametric
trade studies and optimizations are easily executed, especially
when managed using case sets. A revolutionary new dynamic link between
and Thermal Desktop allows SINDA/FLUINT to command Thermal
Desktop to recompute radks, heating rates, conduction, and capacitance
data on the fly from within a SINDA/FLUINT execution. Using the
SINDA/FLUINT Solver, optimizations may now be performed that include
optical properties and geometric sizing as design variables. Thermal
models may be automatically correlated to test data, varying all
aspects of the model including capacitance, conduction and radiation
values. Optimizations may be performed to ideally locate boxes or
electronic components, to size radiators, or minimize weight - now
including radiation dependent design variables.
RadCAD is the
radiation analyzer module for Thermal Desktop. An ultra-fast, oct-tree
accelerated Monte-Carlo ray tracing algorithm is used by RadCAD
to compute radiation exchange factors and view factors. Innovations
by C&R Technologies to the ray tracing process have resulted
in an extremely efficient radiation analyzer. A unique progressive
radiosity algorithm has also been incorporated to compute radiation
exchange factors from view factor data. RadCAD has also incorporated
the progressive radiosity algorithm into heating rate calculations,
resulting in even faster performance. Automatic compression and
decompression of internal database files minimizes disk usage. Powerful
thermal analysis can now be performed using modest desktop computer
hardware, exceeding the performance of most UNIX based workstations.
Please see the RadCAD page for a full list of features.
Radiation and Orbital Heating
FloCAD is a Thermal Desktop module that allows a user to develop and integrate
both fluid and thermal systems within a CAD based environment. FloCAD
adds the capability of modeling flow circuits, including fans and
convective heat transfer, attached directly to the surfaces and
solids representing PCB boards, chips, heat fins, etc. It is specifically
targeted for electronic packaging design tasks, but since it provides
full access to the powerful and general-purpose SINDA/FLUINT thermohydraulic
analyzer, FloCAD will find use in many other applications as well.
Please see the FloCAD page for a full list of features.
Liquid Cold Plate
Unique Capabilities of the Thermal Desktop Suite
Dedicated Surface and Solid Mesher
Boundary Condition mapper
Temperature dependent optical property calculations
Extremely fast algorithms
Aeroheating and TPS simulation (export license required)
COM interface to software such as Matlab® and Excel®
Dedicated Results Plotting Tools
Unique Fluids Modeling Features
Multiple Constituent Modeling
System level modeling of heat pipes
Built-in model correlation, optimization, goal seeking
Reliability Engineering module
New AMG-CG methods are ultra fast for huge/dense models and use minimal memory