altair radioss(tm) – 2019 version - features...

ALTAIR RADIOSS(TM) – 2019 VERSION - FEATURES UPDATE한국알테어김원택 2019.7.11

July 11, 2019 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.©

OVERVIEW OF THE MAJOR FEATURES

Altair�Radioss™�2019�포함 내용 :

• finite�volume�formulation�과 solver�를 이용한신 ALE�multi-material�law

• 신 boundary�element�method�을 사용한수상폭발해석기능

• State�file에 model의 모든 node와 part를 작성하는신기능

• 향상된 contact�interfaces�TYPE24�and�TYPE25�(options,�performances)

• 하나의 contact�정의에 Part�마다 여러마찰조건들을정의할수있게하는신마찰정의

• 동일한형식과 unit일 경우 SUBMODEL�안에 새로운 SIBMODEL을 정의

이밖에도많은개선사항..


NEW ALE MULTI-MATERIAL LAW USING FINITE VOLUME SOLVER



• /MAT/LAW151�(MULTIFLUID)• Available�for�:

• 2D�analysis�with�/TRIA�and�/QUAD�elements• 3D�analysis�with�/BRICK�and�/TETRA4�elements

• Simple�input• Sub�material�LAW5�or�LAW6�identifier�and�volume�fraction

• Compatible�with�• Initial�volume�fraction�/INIVOL• /ALE/MUSCL• FSI�Contact�interface�/INTER/TYPE1�and�/INTER/TYPE18• Fluid�material�only�(will�be�extended�to�elasto-plastic�material)

• Dedicated�for�application�with�high�Mach�number

Richtmyer-Meshkov Instability



/MAT/LAW5 (explo)1,0721

1001 0,0

/MAT/LAW6 (air)

Examplefor blast modeling

Mat.id

Vol. frac.



• /MAT/LAW151�(MULTIFLUID)• Available�for�:

• 2D�analysis�with�/TRIA�and�/QUAD�elements• 3D�analysis�with�/BRICK�and�/TETRA4�elements

• Simple�input• Sub�material�LAW5�or�LAW6�identifier�and�volume�fraction

• Compatible�with�• Initial�volume�fraction�/INIVOL• /ALE/MUSCL• FSI�Contact�interface�/INTER/TYPE1�and�/INTER/TYPE18• Fluid�material�only�(will�be�extended�to�elasto-plastic�material)

• Dedicated�for�application�with�high�Mach�number

Richtmyer-Meshkov Instability



• /INIVEL/FVM�:�• New�option�to�define�initial�velocity�in�the�parts�defined�with�/MAT/LAW151�

• /EBCS/FLUXOUT�:�• New�non-reflecting�outlet�boundary�condition�for�material�/MAT/LAW151

• /EBCS/INLET�:�• New�inlet�boundary�condition�for�material�/MAT/LAW151

Surface to initial volume fraction

non-reflecting outlet boundary condition

Closed outlet condition on free surface (by default)

Material with low density

Material with high density

Initial velocity on the fluid



• /INIMAP1D�:�Map�1D�velocities�and�thermodynamic�values�into�2D�or�3D�space�by�using�spherical,�cylindrical�or�planar�mapping�methods.

• Option�VE�:�map�density,�energy�+�velocity• Option�VP�:�map�density,�pressure�+�velocity

0x0x

50 x 50 x 50 cubic mesh

50 x 50 x 50 cubic mesh

1x

0x 0x

1D to 3D cylindrical mapping

1D to 3D spherical mapping



• /INIMAP2D�:�Map�2D�velocity�and�thermodynamic�values�into�a�3D�axi-symmetric�space

• /FUNC_2D�:�Function�to�define�a�scalar�value,�or�a�vector�value�defined�on�a�subset�of�R²

Mapping results on the 3D mesh2D function to map


NEW FEATURES TO SIMULATE UNDER WATER EXPLOSION USING BEM


UNDER WATER EXPLOSION SIMULATION USING BEM

• /BEM/DAA�:�Doubly�Asymptotic�Approximation�for�Under�water�Explosion�by�Boundary�Elements�Method�(BEM)

• Option�to�compute�the�pressure�on�the�wet�surface�of�structure�coming�from�under�water�explosion

• The�pressure�is�computed�using�Boundary�Elements�Method

Wet surface


UNDER WATER EXPLOSION SIMULATION USING BEM

• /BEM/FLOW�:�Incompressible�Fluid�Flow�computation�by�Boundary�Elements�Method• Model�incompressible�fluid�flow�around�or�inside�close�surface• Node�can�be�used�to�display�the�fluid�velocity• Inlet�and�outlet�condition�are�available.

Air flow around a sphereAir flow inside a pipe

InletOutlet


MATERIAL AND FAILURE MODELS



• /MAT/LAW87�:�material�based�on�Barlat�Yld2000�formulation�for�shell�elements• New�flag�Ifit=1�to�be�able�to�enter�directly�Lankford�parameters�0°,�45°,�90° direction�and�biaxial�loading.

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|/MAT/LAW87/3/1ALU# RHO_I

2.7E-3 0# E Nu IFlag VP coeff_c exp_p

70000 0.3 1# sig00 sig45 sig90 sigb I_fit

133.179899 133.102756 132.330693 162.330301 1# r00 r45 r90 rb

0.703242569 0.486264221 0.865336191 0.546807587#empty line

# exp_a ALPHA NEXP Fcut Fsmooth NRATE8 0.55 0.21 1 0

# ASWIFT EPSO QVOCE BETA KO415. 0.00220 174.7 11.19 132.4

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|


CONTACT INTERFACE


CONTACT INTERFACE

• /INTER/TYPE2�(tied�contact)�• Improvement�for�tied�contact�with�Spotflag=27�and�Spotflag=28�for�the�different�situation�found�in�the�electronic�market�(solid,�shell,�skin�shell,…)

Description Spotflag0 Spotflag1 Spotflag25 Spotflag27 Spotflag28noaddedmassatt=0noaddedmassduringtherunCompatibilitywithotherkin.conditions

models with solids

Description Spotflag0 Spotflag1 Spotflag25 Spotflag27 Spotflag28transfer6DOF(drillingforshells)noaddedmassatt=0noaddedmassduringtherunCompatibilitywithotherkin.conditions

models with shells


CONTACT INTERFACE

• /INTER/TYPE24�(surface�to�surface�contact)�• Improvement�of�the�CPU�cost�for�specific�models.• Improvement�of�the�edge�to�edge�behavior�(Iedge=1)�for�double�and�single�precision�versions.�• New�flag�Irem_i2=1 for�deactivating�the�slave�nodes�if�the�same�contact�pair�(node/segment)�has�been�defined�in�a�TYPE2�interface.


CONTACT INTERFACE

• /INTER/TYPE25�(node�to�surface�contact)�• Improvement�of�the�CPU�cost�and�restart�file�size.• New�feature�Igap=2�to�avoid�self-impact�within�the�same�shell�part�in�case�the�thickness�is�bigger�than�mesh�size.�

• New�feature�Igap=3�to�reduce�the�contact�gap�for�shell�parts�based�on�mesh�size�(%mesh_size).�


CONTACT INTERFACE : FRICTION SETTING

• /FRICTION• Define�different�contact�friction�coefficient�between�set�of�parts�or�couple�of�parts

• The�friction�model�can�be�applied�to�multiple�contact�interfaces�TYPE7,�11,�19,�24�and�25.

• Several�friction�cards�can�be�defined�in�the�model.

Contact 1

Contact 1

Fric=0.1

Fric=0.2 Fric=0.4 Fric=0.3 Fric=0.1

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|/FRICTION/999test no 1# Ifric Ifiltr Xfreq Iform

0 0 0 2# C1 C2 C3 C4 C5

0 0 0 0 0# C6 Fric VisF

0 .2 0#GRpartID1 GRpartID2 PartID_1 PartID_2

111 222 0 0 # C1 C2 C3 C4 C5

0 0 0 0 0# C6 Fric VisF

0 .1 0#GRpartID1 GRpartID2 PartID_1 PartID_2

0 0 1 3 # C1 C2 C3 C4 C5

0 0 0 0 0# C6 Fric VisF

0 .2 0…#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|


MISCELLANEOUS ENHANCEMENT



• //SUBMODEL�:�new�capabilities�to�defined�a�submodel inside�a�submodel• A�submodel can�be�defined�inside�a�submodel.

• The�model�should�be�written�in�the�same�version�as�the�solver�(no�version�translation)• The�unit�option�in�the�//SUBMODEL�card�can�not�be�used• The�version�option�in�the�//SUBMODEL�card�can�not�be�used

• Corrections�on�the�submodel option• Several�compatibility�issues�with�submodels has�been�fixed�(user�material�laws,�group�of�element�defined�by�box,�spring�type�13�and�type�45,�reference�metric…)

• Better�support�of�the�following�options�in�a�submodel :�/SURF/SUBSET,�SPHCEL�,�EREF,�AIRBAG1,�COMMU1• The�options�/MAT/LAW73,�/CONVEC,�/SPHGLO,�/SPHBCS,�/GAUGE/SPH,�/TH/SPHCEL�are�now�compatible�with�SUBMODEL.



/THERMAL

• Option�is�now�available�for�smooth�particle�hydrodynamic�(SPH)

/SKEW/MOV�and�/FRAME/MOV

• New�option�Dir�to�define�the�direction�of�the�axis�defined�by�nodes�N1�and�N2

/ACTIV

• New�option�Tstop�is�available�for�Iform=2�formulation.

/H3D�output�options

The�output�of�the�/RBE2�was�missing�in�the�.h3d�file

Eroded�tetrahedron�elements�are�now�correctly�shown�in�the�.h3d�file.



/TH/INTER

• Tangential�force�is�now�available�for�the�drawbeads contact�interface�/INTER/TYPE8

/DT1TET10

• Gives�more�robust�computation�for�time�step�for�10-node�tetrahedral�/TETRA10.�This�time�step�estimation�is�generally�lower�than�the�standard�one,�but�may�solve�instability�problems.

/REPORT/HTML

• New�option�to�create�html�report�about�the�global�parameters�of�the�model�and�a�global�summary�of�the�results�and�to�create�an�.mvw file.


Thank you for your attention !

altair radioss(tm) – 2019 version - features...

Documents