New Features in LS-PrePost® and its Future Development · LS-PrePost will create all required keyword cards 49 New Features in NVH. 50 An example of the Interface to setup FRF analysis

New Features in LS-PrePost® and

its Future Development

3rd China LS-DYNA Users Conference

Shanghai, China

October 24-25, 2017

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• Introduction

• New Features in Geometry

• New Features in Meshing

• New Features in Rapid Modeling

• New Features in Visualization

• New Features in Metal Forming

• New Features in NVH

• New Features in ICFD

• New Features in XYPlot

• New Features in Miscellaneous Aspects

• Future Development

Contents

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• Version 4.5 has been released in the beginning of this month (October, 2017)

• Support Linux 64-bit systems, Windows 64bits (32-bits windows version has been dropped in this version), Apple Mac OSX

• Support almost all keyword data that is published, including in the development version of LS-DYNA

• Support Fast Rendering mode, which is many times faster than Normal Rendering mode, Ctrl+L to switch and Ctrl+O to save diagnostic infomation

• Download: http://ftp.lstc.com/anonymous/outgoing/lsprepost/4.5

Introduction

A 2-Dimensional tool to create curves on a sketch pad with precise measurement is available

4Pre-defined layout of different kind of curves

New features in Geometry

• Create curve using “Axis of Pipe” from geometry

that its surfaces are forming a pipe shape


• Add “Plane with Shell” option for the Surfaces and

FEA mesh intersection


• Add “Shell with Shell” option for the Finite element

mesh (shell elements) intersection


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Create triangular mesh from point cloud

New Features in Meshing

• Option to pick

node or position

as center of the

ring mesh

• Option to create

multiple rings

• Option to create

rings without

filling the center

with element


• Creation of Ring Mesh

• Option to fill

center hole

with elements

• 2 Rings with

specified radii


• Creation of Ring Mesh

• Support shell high order element meshing in the

automesh


Two new Tetrahedron Meshing methods to provide

better mesh result

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In general method 1 and 2 are more robust than the

old tet-mesher which is method 3

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• 3D solid mesh creation to simulate laser weld

• Very often 2 parts will be jointed together by laser

weld, this can be modeled by 3D solid elements

created from a line defining the weld

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New Features in Rapid Modeling

3D solid element mesh for laser weld

• Pick 2 parts that the laser weld will

be interact with

• Pick a line to define the path

• Define1 layer or 2 layers of solids

• Define the width of the solid element

• Material properties can also be

defined

• *contact_tied_shell_edge_to_surface will be

created

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The solid elements will be created with variable

thickness that conform to the gap between the 2 parts

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• Creation of Joints, Bolts automatically with minimum number

of operations and without knowing the required keyword

• Bolt can be constructed with Beam elements and Constrained

nodal rigid body (CNRB)

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• In a situation when there are many (in the number of several

hundred or thousands) bolts/joints to be created, automatic

option can be used with only one click

• LSPP will automatically find all the matching holes and create

the connectors for each set of holes

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• Entity Creation -> Joint Wizard to make the creation of Joint

easier. With less than 6 clicks, Joint, which contains several

keywords, can be created.


• Create Load/Initial Condition in Cylindrical System


• Support new 5-node 6-face solid element


• Creation of Cohesive Elements

• First create a beam part (shell cohesive) or shell part (solid cohesive)

• Then select the shell or solid part and the pre-created beam or shell part

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• A new application to setup battery packaging

analysis for LS-DYNA EM solver


Keyword Replace Command

Keyword replaceint KeywordName IDRange FieldID NewValue OldValue

Example: To replace all section shell formulation (ELFORM) from 2 to 16 (elform value not equal to 2 will not be changed)

Command Syntax:

Keyword replaceint SECTION_SHELL all 1 16 2

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The IDfield is 1 because it is the second field


The keyword replace command is powerful but the command structure and syntax is not possible to remember

Now this can be done with the help of GUI

Right click on any data field to activate the interface

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• Split Window Enhancement (Right Mouse Button Menu)

• Draw different model selection

• Draw different xy-plot selection

• Get view from other sub-windows

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New Features in Visualization

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• D3HSP file viewing


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Displacement Norm Energy Norm

Residual Norm No. Of Iterations to Converge


• D3HSP file viewing -Plotting quantities control the convergence of an implicit run

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For implicit analysis often the displacement are very small,

fringing the displacement for this kind of problem can be

incorrect in older versions of LSPP. LSPP4.5 has fixed this

problem

LSPP4.3 - incorrect LSPP4.5 - correct


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• Measure Rule• Draw scale on bottom of graphics screen to give reference

size of the model


• Part CG trace

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The Trace Curve function is added to the Activity tab (> Option -> Active Label). In

the post-processing, the tracking curve is mainly used to analyze the position of a

curve on the mesh under different states

State 17 State 13

State 9 State 5 State 1


• *LOAD_SEGMENT data can be fringed in the

model check interface


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• Only one click is needed to chain all loaded models.

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• Reasonable model display if “Lagr+Clip” mode is invoked.

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• Right click the legend bar to allow users to setting it

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• User can specify the history variable number, and then LSPP shows you the vector plot.

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Die System Module (DSM) in LS-PrePost 4.5 for our users to

create tooling surface when the final part is provided Prepping

• Prepare the given part for further processing

Tipping• Tip the part (the flanges excluded) to the desired draw position

Unfolding• Specify how to process the defined flanges

• repair the boundaries

Binder• Create the binder profiles and generate the binder

Addendum• Create the addendum profiles and patches to generate the addendum

Output• Save the created tools and the curves to files

New Features in Metal Forming

• Creation of 3D Drawbead• Real bead modeling is necessary for the

accurate springback prediction after the formability simulation.

• With the line beads as the center lines, 3D Draw bead module directly generates the real bead mesh on the tooling mesh.

New Features in Metal FormingNew Features in Metal Forming

close-loop bead open-loop beadsSmooth transition

Section cut of the generated real bead mesh

• Add EPS (Effective Plastic Strain) FLD in the FLD interface

• Once the FLD EPS is checked and the r-value is input , the

formability diagram will show the EPS FLD results with three

colors : Red:crack,Yellow:marginal,Green:safe

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• Add “Dual View” button – once it is checked, screen divided

into 2 windows, one shows Traditional FLD, one shows the

EPS FLD

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• Add “Dual View” button – once it is checked, screen divided

into 2 windows, one shows Traditional FLD, one shows the

EPS FLD

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• Synchronized highlighted element on both contours when

user click on one the element

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• Compare EPS FLD and Traditional FLD contours , for the different color

areas ,keep and display the contour colors, for the same color areas ,

change the color to grey in EPS FLD window

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• *DATABASE_FREQUENCY_BINARY_{OPTION}

• Ascii DatabasesFRF: frf_amplitude, frf_angle, frf_real, frf_imagBEM acoustics: Press_Pa, Press_dB, bepres, fringe_*, panel_contribution_NID, SSD: elout_ssd, nodout_ssd, …

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Database LSPCode Data Contents

D3SSD 21 Steady state dynamics

D3SPCM 22 Response spectrum analysis

D3PSD 23 Random vibration PSD

D3RMS 24 Random vibration RMS

D3FTG 25 Random vibration fatigue

D3ACS 26 FEM acoustics

D3ATV 27 BEM Acoustic Transfer Vector

New Features in NVH

• Each analysis type has its own interface, unique fringe components

• LS-PrePost will automatically recognize the analysis type and pop up the corresponding interface

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New Features in NVH

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New Features in NVH

• NVH Job Setup

• The 6 NVH analyses are:

FRF – Frequency Response Function

SSD – Steady State Dynamic

Random Vibration Analysis

Response Spectrum Analysis

BEM – Boundary Element Method for Acoustics

FEM – Finite Element Method for Acoustics

• Users should not have to know all the necessary keyword data for each type of analysis. LS-PrePost will create all required keyword cards

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New Features in NVH

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An example of the Interface to setup FRF analysis

New Features in NVH

New Features in ICFD

• A new “Solution Explorer” is used for ICFD pre-processing setup, this

interface allows user to build an entire LS-DYNA input file for ICFD

analysis without knowing the required keyword data

• The solution can be saved, exported, or run directly

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• The Solution Explorer interface has an “Application Tree” that defines the

analysis type, material, part data, boundary condition, loading, output, etc.

• Each of these entities use the “Property Interface” to define all related

parameters and data

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Application

Tree

Property

Interface


• The “Solution Explorer” is also used to manage all data selection and

setup for ICFD Post-Processing. The interface will be activated

automatically when ICFD post files are read in.

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New XY Plot Interface

• The old (2nd generation) interface has too many pop ups

and also occupy the same graphics area as the model

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New XY Plot Interface

• The 3rd generation XY plotting interface will draw XY graphs on a

completely new graphics window. This is perfect for user has dual

monitors

• The dialogs are dockable. It works the same way as in the 2nd generation

interface

• Will use template for repetitive and batch operations in the future

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• Output keyword file exactly as in input order

• Support large BINOUT file that is greater than

4GB

• Support multiple FEMZIP files with SPH data and

temperature data

• Support loading multiple d3hsp files in the

“D3VIEW” dialog

• Comment a keyword data on the form and output

it as “*COMMENT *NODE”

New Features in Miscellaneous Aspects

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Middle mouse click on model to set center of rotation,

this is much faster than clicking the icon and left

mouse click on the model. One click vs. 2 clicks +

mouse travel


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Area selection “Entire” option for elements/parts – the

element/part has to be entirely inside the selection

windows in order to be selected


The newly added data extraction from SCL are:

ids in *set_xx, like *SET_NODE_LIST,*SET_SHELL_LIST,etc

referenced part ids from material id

selection ids

history variable

rigid body velocity

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Future Direction

• Old style Interface (F11) may go away in the future version

of LS-PrePost which will give a faster startup in GUI and

better user interface

• Most of the floating interface dialogs will be dockable

• The entire model data will be represented by a tree

structure which provides a better view to the user

• Very little or no LS-DYNA keyword knowledge is needed to

create entities and setup a complete model

• Metal Forming will be a separated program which provides

complete analysis for stamping applications including pre-,

solver, and post-processing

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• LS-PrePost has been keeping up with the rapid

development of LS-DYNA, both in the post-

processing of results and pre-processing of input

keyword setup.

• Many features and capabilities were implemented

based on users’ requests and suggestions

• We are committed to work with our customers to

provide the tool they need and reduce the burden

of processing the LS-DYNA data

• We are open to advice and happy to listen to our

customers for their needs

Conclusion

“We build LS-DYNA models in other interfaces but then quickly pivot to LSPP. The

reality is that no single interface supports all the capabilities of LS-DYNA better

than LSPP. For post-processing, LSPP is super-fast and is amazing with what

you can do with it. We enjoy all the really cool things you can do and if there is

something you really need from an engineering basis, the team will seriously

consider it and most likely implement it. And if you find a bug, the LSTC team

will kill it and get you a fixed revision the next week.”

“我们使用其他界面建模，不过我们很快就迁移到LSPP。现实是，没有其他界面比LSPP对LSDYNA支持更好。LSPP的后处理超级快，所做之事令人惊奇。如果你真正从工程角度需要什么功能，LSPP团队会认真考虑并且极有可能实现。如果你发现一个bug，LSPP团队会迅速纠正，并且在下周给你一个版本更正”

George Laird, PhD, PE,

Principal Mechanical Engineer

Predictive Engineering

A User’s Comments

Documents

New Features in LS-PrePost® and its Future Development · LS-PrePost will create all required keyword cards 49 New Features in NVH. 50 An example of the Interface to setup FRF analysis