"Flotherm XT软件2021.1用户指南"

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The Simcenter Flotherm XT User Guide provides comprehensive instructions and information for utilizing the software version 2021.1. This guide, created by Siemens, contains valuable trade secrets and confidential information that should only be accessed and used as outlined in the customer's agreement with Siemens. The User Guide covers various aspects of the software, including installation, setup, and configuration. It offers detailed explanations on how to effectively utilize the features and tools within Flotherm XT to optimize thermal design processes. Users will find step-by-step instructions, practical tips, and best practices for efficient thermal analysis and simulation. Additionally, the User Guide emphasizes the importance of data security and confidentiality. Users are reminded not to copy, distribute, or disclose any information from the guide outside of their organization or to unauthorized individuals. This highlights Siemens' commitment to protecting their intellectual property and maintaining the confidentiality of their proprietary information. Overall, the Simcenter Flotherm XT User Guide serves as a valuable resource for users looking to maximize their use of the software and enhance their thermal design capabilities. By following the guidelines and recommendations outlined in the guide, users can effectively leverage Flotherm XT to achieve optimal thermal management solutions for their projects.

List of Figures

Simcenter™ Flotherm™ XT User Guide, v2021.1

Figure 16-4. Passive Calibration Chart Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437

Figure 16-5. Active Calibration Chart Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437

Figure 17-1. TDxSW Driver Add-In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444

Figure 17-2. Overlapping Faces on Geometry-Built Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . 445

Figure 17-3. Flow Device Entry and Exit at a Component and at a Boundary . . . . . . . . . . . 445

Figure 17-4. Flow Direction for an Internal Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 446

Simcenter™ Flotherm™ XT User Guide, v2021.1

List of Tables

Table 3-1. Top-Level Nodes of the Feature Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 3-2. Components Context-Sensitive Menu Options in Alphabetical Order . . . . . . . . 31

Table 3-3. Property Sheet Icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 4-1. Variables Calculated for Solution Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Table 4-2. Internal Enclosure Model Default Settings and Values . . . . . . . . . . . . . . . . . . . 81

Table 4-3. Simple Card Slot Model Default Settings and Values . . . . . . . . . . . . . . . . . . . . 82

Table 4-4. Standard Forced Air Model Default Settings and Values . . . . . . . . . . . . . . . . . . 83

Table 4-5. Standard Still Air Model Default Settings and Values . . . . . . . . . . . . . . . . . . . . 85

Table 4-6. New Project Wizard Empty Project Default Settings and Values . . . . . . . . . . . . 89

Table 4-7. Default Model Data Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Table 4-8. Default Initialization Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Table 9-1. Transient Analysis Videos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Table 10-1. Global Goal Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

Table 10-2. Volume Goal Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Table 10-3. Surface Goal Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

Table 10-4. Difference Goal Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

Table 11-1. Surface Data Inspector Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319

Table 11-2. Surface Data Inspector Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

Table 11-3. Volumetric Data Inspector Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322

Table 12-1. Reports Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

Table 14-1. Parametric Study Videos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

Table 16-1. Correlation Between Scenario and Experimental Data . . . . . . . . . . . . . . . . . . . 420

Table 16-2. Calibration Chart Overview Icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438

Simcenter™ Flotherm™ XT User Guide, v2021.1

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Chapter 1

Working With Simcenter Flotherm XT

Simcenter

™

Flotherm

™

XT software is a thermal modeling analysis tool designed to simulate

the air flow and heat transfer in electronic systems, subsystems, and packages.

Such simulation can be used during the earliest stage of electronics systems development to

observe the effects of design changes on the thermal behavior, prior to building and testing the

prototype.

Overview of Simcenter Flotherm XT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Introduction to the Main Aspects of Simcenter Flotherm XT. . . . . . . . . . . . . . . . . . . . . 20

Starting Simcenter Flotherm XT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Overview of Simcenter Flotherm XT

Simcenter Flotherm XT uses Computational Fluid Dynamics (CFD) to analyze airflow and heat

transfer and is specifically designed to investigate these phenomena within electronics

equipment.

Airflow (natural and forced) and heat transfer (as conduction, convection, and radiation) are

governed by conservation laws that can be expressed in a partial differential form. In

Simcenter Flotherm XT, the conservation equations are converted to a finite volume form. As

the name implies, the converted equations require a volume in which values of temperature,

pressure, and velocity are calculated. Hence the space (called the solution domain) that is being

represented in the model is divided into smaller volumes, known as mesh cells.

The more mesh cells in the model, the more points are calculated and the better the resolution of

the case, but this is at the expense of additional computer overheads to calculate the results.

The conservation equations are coupled (values for a variable depend on surrounding values of

that variable and also other variables) and non-linear. Hence they are solved in an iterative

manner, until the errors in the conservation equations are at an acceptable level.

For each model/project, you define the overall dimensions of the volume or enclosure to be

investigated, including the individual components that make up the design structure, and

Simcenter Flotherm XT superimposes a mesh. Each mesh cell denotes a region for which

Simcenter Flotherm XT calculates flow values (velocities, temperature, pressure, and so on) for

the model.

The properties of the air flow (for example, density, viscosity, specific heat) set at the default

values for dry air at 30°C can be changed, if necessary, to reflect the type of coolant used.

Simcenter™ Flotherm™ XT User Guide, v2021.1

Working With Simcenter Flotherm XT

Introduction to the Main Aspects of Simcenter Flotherm XT

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Appropriate boundary conditions (for example, ambient temperature, known mass flow rate and

heat sources) can also be added.

During program solution, Simcenter Flotherm XT integrates the relevant differential

conservation equations over each mesh cell, assembling a set of algebraic equations which

relate the value of a variable (for example, the temperature) in a cell to its value in its adjacent

neighboring cells.

Working with Simcenter Flotherm XT, you define the requirements, set up the mathematical

modeling parameters, construct the geometry, add solution mesh, solve the solution and display

the results.

Introduction to the Main Aspects of Simcenter

Flotherm XT

Solution domain, initial conditions, meshing, solving, and results.

Solution Domain

Simcenter Flotherm XT analyzes the model geometry and generates a solution domain

enclosing the model.

The solution domain’s boundary planes are orthogonal to the model’s global coordinate system

axes.

For external flows, the solution domain’s boundary planes can be distanced from the model.

For internal flows, the solution domain’s boundary planes automatically envelop either the

entire model (if heat conduction in solids is considered) or the model’s flow passage only (if

heat conduction in solids is not considered).

You can manually resize or redefine the solution domain using several options:

• By changing the solution domain’s dimensions

• By specifying symmetry planes

• By specifying periodic boundary conditions

When modeling internal flows, all the model openings must be closed with lids. This is a

requirement because boundary conditions at inlets and outlets must be defined on surfaces in

contact with the fluid, and lids provide these surfaces. You can create lids as Boss-Extrude

features on a part or as separate components in an assembly.

When modeling external flows, far-field boundary conditions are specified on the solution

domain boundaries.

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