particles basic english

RecurDyn Particles Tutorial (Basic)

R E C U R D Y N P A R T I C L E S T U T O R I A L ( B A S I C )

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Copyright 2014 FunctionBay, Inc. All rights reserved.

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RecurDyn is a registered trademark of FunctionBay, Inc.

RecurDyn/Professional, RecurDyn/SOLVER, RecurDyn/SOLID, RecurDyn/FLEX, RecurDyn/NodalFlex, RecurDyn/LINEAR, RecurDyn/CONTROL, RecurDyn/TRACK_HM, RecurDyn/TRACK_LM, RecurDyn/CHAIN, RecurDyn/MTT2D, RecurDyn/MTT3D, RecurDyn/BELT, RecurDyn/HAT, RecurDyn/HYDRAULIC, RecurDyn/Gear, RecurDyn/Tire are trademarks of FunctionBay, Inc.

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RecurDyn/Particles contains the SAMADII solver, owned and developed by Metariver Technology co. ltd.

Edition Note

These documents describe the release information of RecurDyn V8R3


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Table of Contents

Getting Started ................................................................................................ 4

Objective ............................................................................................................................... 4

Audience ............................................................................................................................... 4

Prerequisites ......................................................................................................................... 4

Procedures ............................................................................................................................ 4

Estimated Time to Complete this Tutorial ............................................................................. 5

Creating the Initial Model ................................................................................. 6

Task Objective ...................................................................................................................... 6

Estimated Time to Complete this Task ................................................................................. 6

Starting RecurDyn ................................................................................................................. 7

Modeling Geometries ............................................................................................................ 8

Creating Revolute Joints ....................................................................................................... 9

Saving the Model ................................................................................................................ 10

Creating Particles .......................................................................................... 11

Task Objectives................................................................................................................... 11

Estimated Time to Complete this Task .............................................................................. 11

Creating Particles ................................................................................................................ 12

Defining Walls ..................................................................................................................... 15

Setting Boundaries .............................................................................................................. 16

Performing Analysis ...................................................................................... 19

Task Objective .................................................................................................................... 19

Estimated Time to Complete this Task ............................................................................... 19

Performing Dynamic/Kinematic Analysis ............................................................................ 20


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Getting Started

Objective

In this tutorial, you will learn how to:

Create particles and walls.

Define analysis boundaries in Particles.

Import/Export particle sets.

Audience

This tutorial is intended for intermediate users of RecurDyn who know how to create geometries, joints, and force entities. All new tasks are explained thoroughly.

Prerequisites

Users should work through the 3D Slider Crank Tutorial or an equivalent tutorial before they begin this tutorial. We also assume that you have a basic knowledge of physics.

Procedures

The tutorial consists of the procedures outlined in the following table. This table also displays the time required to complete each procedure.

Procedures Time (minutes)

Modeling Geometries 15

Creating Particles 5

Defining Walls 5

Defining Boundaries 5

Performing Dynamic/Kinematic Analysis 30

Total: 60

Chapter

1


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Estimated Time to Complete this Tutorial

This tutorial takes approximately 60 minutes to complete.

RecurDyn/Particles is supported only in the RecurDyn x64 edition. If you cannot locate the RecurDyn/Particles UI in your RecurDyn environment, then please check whether you have installed the x64 edition of RecuDyn V8R2 or later version.

RecurDyn/Particles requires an NVIDIA graphics processing unit (GPU) that supports the CUDA (Compute Unified Device Architecture) platform. Please ensure that your GPU supports CUDA before you attempt to use RecurDyn/Particles. You can check whether your GPU supports CUDA at https://developer.nvidia.com/cuda-gpus

We recommend that you use one of the following GPUs or later.

NVIDIA Tesla C/S/M 2070/2050/1060 NVIDIA GeForce GTX 590/580/570/560/550 /480/470/465/460/450, etc.

We recommend that you install the latest GPU driver supplied by NVIDIA. You can download the latest driver from the NVIDIA website: http://www.nvidia.com/Download/index.aspx?lang=en-us

Some newer laptops with an NVIDIA GPU may encounter problems when you try to run simulations in RecurDyn/Particles. If this occurs, you should configure your laptop to always use the NVIDIA GPU to run RecurDyn.


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Creating the Initial Model

Task Objective

In this chapter, you will learn how to create a simple model that you can fill with particles and use for analysis.

Estimated Time to Complete this Task

5 minutes

Chapter

2


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Starting RecurDyn

To start RecurDyn and create a new model:

1. On your Desktop, double-click the RecurDyn shortcut.

RecurDyn starts and the Start RecurDyn dialog box appears.

2. In the Name text box, type ParticleTest as the name of the new model.

3. In the Gravity list, select Y. Do not change any other options.

4. Click OK.

Tip: Characters Allowed in Entity Names You cannot use spaces or special characters in the model name or any other RecurDyn entity name. You can use an underscore to add spacing and improve the readability of the name.


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Modeling Geometries

In this procedure, you will make two geometries. The box of two geometries will be used to hold the particles and for analysis.

To create two geometries:

1. From the Body group in the Professional tab, click Cylinder.

2. Set the Creation Method toolbar to Point, Point.

Cylinder1:

Point1: 0, 0, 0

Point2: -500, 0, 0

3. From the Body group in the Professional tab, click Box.

4. Set the Creation Method toolbar to Point, Point, Depth.

Box1:

Point1: -600, 100, 0

Point2: -400, -100, 0

Depth: 200

The cylinder and box you created should resemble the example in the following figure.


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Creating Revolute Joints

In this procedure, you will create two revolute joints.

To create revolute joints:

1. From the Joint group in the Professional tab, click Revolute.

2. In the Creation Method toolbar, set the creation method to Body, Body, Point.

RevJoint1:

Base Body: Ground

Action Body: Body1 (the cylinder)

Point: 0, 0, 0

RevJoint2:

Base Body: Body1 (the cylinder)

Action Body: Body2 (the box)

Point: -500, 0, 0

The revolute joints you created should resemble the example in the following figure.


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Tip: Changing the icon color of the joint To change the icon color of the joint:

1. On the Home tab, in the Model Setting group, click Display.

2. In Appearance Color, select a new color for the Icon option.

Saving the Model

At this juncture in the tutorial, you should take a moment to save your model before you continue to the next chapter.

1. On the File menu, click Save.

2. Type the name of the model, and then select the save location.

3. Click Save.


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Creating Particles

Task Objectives

In this chapter, you will learn how to fill the box you created in chapter 2 with particles and configure the environment for the analysis

You will also learn the concepts behind particles, walls, material properties and boundaries.


10 minutes

Chapter

3


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Creating Particles

You can use particles to fill geometries. In this procedure, you will fill the box you created in chapter 2 with particles.

To create particles in the box:

1. From the Particle group in the Particle tab, click Particles.

2. Select Body2 (the box) to open the Create Particle Set dialog box.

3. In the Material column, click the Mat button to open the Material Properties dialog box.


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4. Click Add to create a new material property, enter 0.5 for the Damping Factor column, and

then click OK to close the dialog box.

5. Select Y for the Packing Direction option, and then enter 5 for the Radius column and 30 for

the Ratio* column.

*The ratio is the volume of the geometry that will be filled with particles. In this example, 30% of the geometry will be filled with particles.

6. Click OK to create the Particle Set.

The particles you created should resemble the example in the following figure.


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You can select the particle you created in the Database window.

Tip: Packing Direction

If you select X for the packing direction, then the particles are arranged in the following manner.

If you select Z for the packing direction, then the particles are arranged in the following manner.


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Defining Walls

Particles interact with each other as well as with walls. Since particles do not interact with the geometries directly, you must use the existing geometries to define walls.

In this procedure, you will define a wall using Body2 (the box), because the box will hold the particles.

Defining walls using the box:

1. From the Particle group in the Particle tab, click Wall.

2. Click Body2 (the box) to open the Wall dialog box.

3. Click M to define the Material menu, and then select Material1. (You can also create a new material property.)

4. Select Down for the Normal Direction option. This means that the internal surface of the geometry will interact with the particles.


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The following figure displays the normal direction.

5. Click OK to create the wall. You can select the wall in the Database window.

Setting Boundaries

Now, you must configure the boundaries for the particles. During analysis, the particles must exist inside the defined boundaries otherwise the analysis can fail or produce incorrect results.

To create boundaries, you must estimate where the particles will be located during analysis and define the boundaries based on that estimation.

Since the particles fill the box, and the box is constrained by a cylinder, the particles can exist in the circle shown in the following figure.


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To define boundaries:

1. From the Particle group in the Particle tab, click Boundary to open the Boundary dialog box.


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The Boundary dialog box shows the default boundary values and a model of the boundaries.

2. Enter the values shown in the following figure.


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Performing Analysis

Task Objective

In this chapter, you will learn how to run a simulation using the model you just created.


5 minutes

Chapter

4


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Performing Dynamic/Kinematic Analysis

A dynamic/kinematic analysis shows how the particles behave and move in a model.

To perform a dynamic/kinematic analysis:

1. From the Simulation Type group in the Analysis tab, click Dyn/Kin.

2. When the Dynamic/Kinematic Analysis dialog box appears, use the default values for the

parameters in the General tab.

3. On the Parameter tab, change the value

of the Initial Time Step menu.

Initial Time Step: 1.e-004

4. Click Simulate.

5. On the Animation toolbar, press the Play button to start the animation. Refer to the 3D Crank Slider tutorial for more information on how to play animations.

6. Click the Stop button to reset the model.


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Tip: Exporting/Importing Particle Sets

To export particle sets:

1. From the Particle group in the

Particle tab, click Export.

2. Select the file extension. (*.par: text file, *.bin: binary file)

3. Click Save to save the particle sets in the current model.

To import particle sets:

1. From the Particle group in the

Particle tab, click Import.

2. Select the file to import, and then click

Open.

Output folder

After a simulation, the program creates an output folder that stores the result files, such as the *.rad and *.rplt files, from the simulation. The output folder also contains *.bin files that have information about the location of each particle at each time step. You can use the Import function to import

these files.

Thanks for participating in this tutorial!

RecurDyn Particles Tutorial (Basic)Registered Trademarks of FunctionBay, Inc. or Its SubsidiariesThird-Party TrademarksEdition NoteGetting StartedObjectiveAudiencePrerequisitesProceduresEstimated Time to Complete this Tutorial

Creating the Initial ModelTask ObjectiveEstimated Time to Complete this TaskStarting RecurDynTo start RecurDyn and create a new model:

Modeling GeometriesTo create two geometries:

Creating Revolute JointsTo create revolute joints:

Saving the Model

Creating ParticlesTask ObjectivesEstimated Time to Complete this TaskCreating ParticlesTo create particles in the box:

Defining WallsDefining walls using the box:

Setting BoundariesTo define boundaries:

Performing AnalysisTask ObjectiveEstimated Time to Complete this TaskPerforming Dynamic/Kinematic AnalysisTo perform a dynamic/kinematic analysis:To export particle sets:To import particle sets:Output folder

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