Force Based Submodeling

CanOzcan_VesikalikEven with today’s increased computing power and optimized software, submodeling is a powerful technique to perform analysis on detailed regions of assemblies. Recent versions of ANSYS Mechanical software have easy to use implementation for submodeling, where one can perform cut boundary interpolations all in Workbench environment, without the need of writing good old APDL code.

Submodeling in ANSYS Mechanical (and APDL) is based on interpolation displacements from global level to submodel level at cut boundaries. This approach comes with the assumption that the stiffness of the submodel region does not differ much in stiffness from the global model. This assumption holds most of the time. However, there are cases where one would like to apply structural loads from global model, rather than the displacements. This is especially a requirement when the stiffness of the model is reduced in the modeled sub region. The technique can be also called “Force Based Submodeling”. Below is a naïve implementation of force based submodeling for solid-to-solid case.

Can Pic 1

Need: We would like to apply the force being carried by supports in a submodel, rather than performing a displacement based submodel. The design of the support is changed such that it will invalidate global displacement results. Therefore we propose a way to extract reaction forces at cut boundaries rather than displacements in classical submodeling sense.

Algorithm:

  1. Perform global analysis with coarse mesh
  2. Generate a submodel(a.k.a. initial submodel) analysis, with exact same geometry of global analysis with coarse mesh. This will allow one to get reaction forces where cut-boundary displacements are applied
  3. Extract reaction forces on cut-boundary faces
    1. Can extract reaction forces on whole surfaces and apply them as remote forces with deformable boundary option
    2. Can extract reaction forces on each node and apply in final submodel by ensuring same mesh on cut-boundaries between initial submodel and final submodel
  4. Generate a submodel (a.k.a. final submodel) with updated support design
  5. Apply reaction forces calculated from initial submodel
  6. Solve for final submodel and post-process

Example Case#1

I have built a simple model to test the above mentioned concept:

Set 1

 

 

 

 

Fig. Boundary conditions (a) Global model (b) Initial submodel

When I compare the stress at fixed support surface I get identical Von Mises stress distribution.

Set 2

 

 

 

 

Fig. Von Mises stress at fixed support surface (a) Global model (b) Initial submodel

An APDL code is developed to extract nodal reaction forces from the initial sub model as follows:

Can Image

The text file generated by APDL code based on “initial submodel”, is then manually copied to solver directory of the “final submodel”. This process can be automized by saving the file to “user files” directory instead.

The content of the reaction force text file is then read into “final submodel” by the following APDL code:

APDL code to read submodel data

Comparing the stresses and displacements there is perfect match between global, initial and final submodel models.

Set 3

 

 

 

Fig. Von Mises Stress (a) Global Model (b) Initial submodel (c) Final submodel

Set 4

 

 

 

Fig. Total displacements (a) Global Model (b) Initial submodel (c) Final submodel

 

By Can Ozcan


Ozen Engineering Newsletter – November 2015

 


Message from your ANSYS Channel Partner

metinAs we are heading into November, there are more exciting news planned for the ANSYS users in version 17. At this point in time, our staff is getting trained on R17 and then we will have seminar/webinars to pass the new information on to you. One of the most exciting news is the new product packaging that I can briefly talk about: on the structural side ANSYS currently has 11 products, and with R17, the number of products will be reduced to 5. The specialized modules will be bundled into the new products. This will enable ANSYS users to use more technology and get more productivity from their ANSYS simulations. We are planning on calling and making appointments with our clients to introduce the new product bundles. So, you will be hearing from us and we hope that you will be able to put aside some time for our presentation of these new and exciting ANSYS products and technology. Thank you for your business and we look forward to visiting you in the next couple months. In the meantime, please feel free to contact me if I can be of help with your ANSYS software products. Have a great November!


Message from the Sales ManagerCaseyImageNov

Hot Events in November!

caseyANSYS R17 is around the corner and will be released in January 2016. There is going to be a new packaging and pricing for ANSYS Mechanical products with significant new capabilities that we think it is important for all our customers to learn about. We will continue to visit our customers to introduce the exciting new ANSYS bundles for the remainder of 2015 to ensure that the transition to the new product portfolios are as smooth as possible.

Also we have two exciting Lunch & Learns scheduled this month. One is High Frequency Electromagnetics using ANSYS HFSS on November 18th, 2015 and the other is a relatively new workshop which is focused on CFD applications for mixing to be held on November 11th, 2015. This is an important application for pharmaceutical, biomed and chemical industries. Attendees will learn about the common design challenges such as ensuring high efficiency by minimizing blend time and identifying the optimum compromise between high agitation and micro-organisms preservation via exposure analysis. Please take a few minutes to watch this video about mixing analysis.

We are looking forward to seeing you!

Casey.Heydari@ozeninc.com

(408) 732-4665


Paper of the Month!

Sensitivity Analysis in optiSLang

WPoptiSLang

Download Paper


Tip of the Month

(Regular/Anti/Linear Periodic) Symmetry in Mechanical

kaan
Are you seeing the patterns in your model that allow you to cut your model size in half or even more? Taking advantage of symmetry is one of the best ways to make your models more efficient and there are several different types available in the Mechanical application. If you don’t see a Symmetry object in your tree you can select the Model object and press the Symmetry button on the toolbar to insert it. If you right click here and insert a Symmetry Region, you have access to three different types of symmetry:
Symmetry: The most common type of symmetry, applicable to when you have a mirror image of both geometry and boundary conditions. Try to use more than one symmetry plane for quarter or even 1/8th symmetry if possible! The constraints on a symmetry surface are analogous to the Friction-less Support boundary condition.ToM_Oct2015_2
Anti-Symmetry: A less common type of symmetry but still a big help if it can be applied. When you have a mirror image as far as the geometry is concerned but loads that perfectly oppose each other not in the perpendicular direction of the plane of symmetry. The supports at the symmetry plane are analogous to the Symmetry supports, except the degrees of freedom restrained rotationally are restrained translationally and vice-versa.
Linear Periodic: Another common symmetry type for when you have several repeating cells. There are actually two ‘symmetry surfaces’ involved here and constraint equations are used to have both ends of the linear periodic region have matching deformation. With R16, thermal and thermal-electric analysis are supported, in addition to structural.
ToM_Oct2015_1
Please contact Kaan@ozeninc.com with any questions.

Tip of the Month

Antenna Design for Medical Implants

Engineering simulations help healthcare and biomedical industries to accelerate their product development. Medical implants that transmit/receive data wirelessly need antenna designs. ANSYS HFSS offers very advanced features for miniaturized antenna and their matching circuit designs. The Medical Implant Communication Services (MICS) band ranging from 402 to 405 MHz is designated band by American Federal Communications Commission (FCC) for implantable devices. With HFSS, implant antennas and their matching circuits can be designed. ANSYS offers detailed human-body models which work well with HFSS. Therefore, antenna performance can be optimized when implanted in the body model. The Simulation results can be evaluated and optimized for resonance frequency, reflection coefficient, radiation characteristic, Effective Radiated Power (ERP), and Specific Absorption Rate (SAR) of the antenna embedded in the body model. For more information, please visit our website:

HFSSTipNov

Implanted PIFA antenna in ANSYS male human body model and Local SAR distribution at 402MHz in HFSS

 Please contact Mehrnoosh.Khabiri@ozeninc.com with any questions.

ANSYS Hot Topics!

OEI Asked: “Why did you learn ANSYS”

benAt Ozen Engineering we often ask our guests to share their reasons for wanting to learn ANSYS. We hear many reasons but the most common theme is simply ongoing professional development. No matter what career field we’re involved in, continuing your education is arguably the only way to stay up-to-date with today’s fast paced industry. At Ozen Engineering we are committed to being a resource for enriching the engineering community and ensuring that our colleagues remain competitive on the front lines of innovation.

It is a well-known fact that engineers are some of the most educated and bright individuals in the world today. We believe that by continuing to learning new skills and new tools you are able to unleash your inner genius to the fullest extent!

We all want the products of our imagination to become a reality sooner than later, and we believe ANSYS and engineers make that possible. While nearly every university in the United States is using ANSYS and teaching students the skills needed to enter the workforce, we knew that to be truly successful and competitive we needed to offer you something you can’t receive anywhere else. Our ANSYS training courses go beyond the basic curriculum to include comprehensive and tailored modules to maximize your learning experience with industry relevant examples and exercises.

Our classes fill up fast and we insist that our colleagues remain to be the most valuable assets in the workforce!

“Engineering is a great profession.” –Herbert Hoover

There’s no time to waste! Contact me now, Ben.Habr@ozeninc.com, with any questions.


Lunch & Learn – ANSYS CFD & Mixing

November 11th, 2015 11:30AM – 1:00PM (lunch provided)

ANSYS CFD (Fluent and CFX) software contains the broad physical modeling capabilities needed to model mixing and bio-reactor behavior.

CFD is of great value to overcome mixing design challenges because CFD can perform blend times and exposure analysis. Due to the complexity of mixing tanks and bioreactors geometries (impellers, shafts, baffles, sparger, etc.) performing CFD analysis can be seen as complex.

ANSYS computational fluid dynamics offers a solution to this challenge: a fully automated solution where engineers input the mixing tank geometric parameters and operating conditions – the complete design analysis is then performed automatically and a summary report is created so engineers can access all key parameters related to blend time and exposure analysis.

Join us for this lunch & learn event as we discuss applications of ANSYS CFD and how it can improve your products!

Upon completion of this event, attendees are eligible to receive a 14-day evaluation license of ANSYS CFX or Fluent.

Register Now


Lunch & Learn – ANSYS HFSS

November 18th, 2015 11:30AM – 1:00PM (lunch provided)

Join us for this upcoming Lunch & Learn about ANSYS HFSS! This workshop will review HFSS capabilities for antenna analysis. The important antenna parameters are reviewed, and different aspects of antenna design using HFSS will be discussed. Reserve a seat now and we’ll show how ANSYS can help you to simulate high frequency interactions and solve radiation challenges.

Upon completion of this event, attendees are eligible to receive a 14-day evaluation license of ANSYS HFSS.

Register Now


Lunch & Learn – ANSYS AIM Multiphysics

December 2nd, 2015 11:30AM to 1:00PM (lunch provided)

Join us for this upcoming Lunch & Learn about the new ANSYS AIM Multiphysics Platform! ANSYS AIM, the new ANSYS multiphysics platform, makes it easier than ever for designers to perform multiphysical simulations to account for the many different interactions that increasingly affect today’s products.

Join us for this seminar to see a number of multiphysics simulations covering various applications using AIM. Learn how AIM can help you to simulate fluid-structure interactions and solve thermal-electrical-structural challenges.

Upon completion of this event, attendees are eligible to receive a 14-day evaluation license of ANSYS AIM.

Register Now


 Upcoming ANSYS Training/Events In Novemberacademic_logo_medium

ANSYS Mechanical Heat Transfer

Electromigration Simulation in ANSYS

New! Lunch & Learn: ANSYS CFD & Mixing

Introduction to ANSYS Mechanical

New! Introduction to ANSYS HFSS

Introduction to ANSYS Icepak

New! Lunch & Learn: ANSYS HFSS

New! Lunch & Learn: ANSYS AIM Multiphysics

Browse and sign up for classes directly on our website, no phone call or email needed.


OzenCloud

Scale Up Your ANSYS Workloads

ozen cloud newest
Is your compute environment too small to handle your ANSYS workloads?

OzenCloud is a perfect platform for customers who are concerned about surge capacity and compute resources or have a short term project but do not wish to commit to a license purchase. In addition, OzenCloud provides dramatic performance improvements to FEA and CFD simulations, leveraging advances HPC technologies from the world’s leading hardware vendors.

If you need any easy to use, on-demand and scalable simulation environment at affordable prices, contact us today for an OzenCloud trial.


New! ANSYS Advantage Available

Excellence in Engineering Simulation

Advantage_banner

Download Now


Promotions

November Promotional Code: OEI1115-2000

Use the promotion code above to learn about our exclusive offers!

Every month, Ozen Engineering offers a special promotion on ANSYS products and/or training classes. Please visit our promotions page to learn more about our exclusive promotional pricing.

Learn More


Ozen Engineering, Inc.
Newsletter
1210 E. Arques Ave #207
Sunnyvale, CA 94085
(408) 732-4665

Ozen Engineering Newsletter – October 2015

OZEN ENGINEERING

NEWSLETTER OCTOBER 2015


 

Message from the President

metinBy Metin Ozen

We started October with a small amount of precipitation here in Silicon Valley. It is a most welcome moment during this historical drought we are in. We are hoping that this is the beginning of a rainy fall and winter. We need to make up for one year of rain! So, it is exciting to see raindrops early in October.

This month, we are also excited about ANSYS Low and High Frequency

Electromagnetics software products. We are getting very positive feedback from our clients as well as our in-house use of these simulation products proved them to be the industry leading simulation products. It is not only the one physics we can solve for but also coupling different physics and simulating the full product performance. A good example is a wearable device; these devices have high frequency antennas wrapped in an almost circular shape which changes the performance of the antenna from its original shape. Using ANSYS simulation software tools, designers and maufacturers of these wearables devices can simulate the performance of the antennas as well as addressing mechanical reliability and any comfort/heat transfer aspects. You are going to find more detailed information on this in this newsletter in addition to a lunch and learn event we will have later in October. We will also have a lunch and learn event on Icepak late in the month. So, welcome to October and please let me know if/how I can be of help with your simulation software needs.


 

Message from the Sales Manager

caseyBy Casey Heydari

ANSYS and Cray Smash Supercomputing Records!

 

We are pleased to announce that ANSYS and Cray Inc. have smashed the previous simulations record by scaling ANSYS Fluent to 129,000 compute cores!

coresScaledOCT2015

The previous record about a year ago when ANSYS announced that Fluent has scaled to 36,000 cores with the help of NCSA. The dramatic 4x performance improvement over the previous record is not only significant but also opens up possibilities for complete virtual prototype and build! The complex multiphysics simulation on an industrial combustor was run on Cray XC30 supercomputer at 90% efficiency.

Though majority of our customers will not run more than 1000 cores, this technological breakthrough demonstrates that the capabilities are readily available at the fingertips for virtual prototyping.

The flexible ANSYS HPC licensing options allow scalability to desirable computational level a simulation requires, from individual HPC bundles to small workgroups up to virtually unlimited parallel capability.

ANSYS HPC can dramatically improve productivity of the engineers, reduce costs and improve product’s time-to-market.

HPCFlexibilityOCT2015

If you are interested to learn more about the ANSYS HPC offerings, please contact me at:

Casey.Heydari@ozeninc.com

(408) 732-4665


 

Paper of the Month!

Design and Simulation of Implantable PIFA in Presence of ANSYS

Human Body Model for Biomedical Telemetry Using ANSYS HFSS

By Mehrnoosh Khabiri

TipofMonthJune2015#1

Download Paper


 

Tip of the Month!

               ANSYS HFSS for Antenna Arrays

mehrnooshBy Mehrnoosh Khabiri

ANSYS HFSS offers very advanced features for antenna designs. For large finite arrays, you can do explicit analysis and analyze the entire finite array model in HFSS.  Although major challenges in explicit are large number of elements (unit cells), large number of excitations, and complicated meshing process. The other solution is finite array Domain Decomposition (DDM). It utilizes replicated DDM unit cell to address array concerns and obtains accurate results that match HFSS explicit simulations. Also, DDM distributes RAM and reduces solve time. Try it and take advantage of Finite Array DDM Tool!

HFSS_OCT_Tip2015


 

ANSYS Hot Topics!

ben

ANSYS AIM 16.2

By Ben Habr

Have you seen what ANSYS AIM can do? This tool is a fully integrated multiphysics simulation environment created with all engineers in mind. This is the further realization of ANSYS Workbench which is revolutionizing engineering processes through simulation driven product development. Take a look at our overview video below and visit our ANSYS AIM page to see it in action!

ANSYS AIM in Action


Lunch & Learn – ANSYS HFSS

October 20th, 2015 11:30AM to 1:00PM (lunch provided)

hfss-antenna-finite-array

Join us for this upcoming Lunch & Learn about ANSYS HFSS!

This workshop will review HFSS capabilities for antenna analysis. The important antenna parameters are reviewed, and different aspects of antenna design using HFSS will be discussed.

Reserve a seat now and we’ll show how ANSYS can help you to simulate high frequency interactions and solve radiation challenges.

Register Now


 

Lunch & Learn – ANSYS Icepak

October 27th, 2015 11:30AM – 1:00PM (lunch provided)

Join us for this upcoming Lunch & Learn about ANSYS Icepak!

We would like to share with you the latest developments in rapid simulations for electronic systems. ANSYS Icepak combines advanced solver technology with robust, automatic meshing to enable engineers to rapidly perform heat transfer and fluid flow simulation for a wide variety of electronic applications including computers, telecommunications equipment, semiconductor devices, aerospace, automotive and consumer electronics.

ansys-icepak-2-bg

Join us for this free seminar to see how you can apply ANSYS Icepak to your projects!

Register Now


 

OzenCloud Online Webinar – October 7th, 2015

Scale Up Your ANSYS Workloads

ozen cloud newest

Is your compute environment too small to handle your ANSYS workloads?

In the first 15 minutes of the webinar, you will learn about OzenCloud’s ANSYS offering.

Next 30 minutes will be a step by step, guided demonstration for all participants who are interested in learning how to scale ANSYS on OzenCloud.

We will reserve the last 15 minutes for your questions.

This webinar is co-organized by Ozen Engineering and UberCloud.

Online webinar – October 7th, 2015 at 11:00 AM – 1:00 PM PST

Register Now


 

Upcoming ANSYS Training/Events In October

OzenCloud Webinar

ANSYS Mechanical Linear and Nonlinear Dynamics

Introduction to ANSYS Mechanical

NEW! ANSYS HFSS – Free Lunch & Learn

ANSYS AIM Multiphysics

Introduction to ANSYS SpaceClaim Direct Modeler

NEW! ANSYS Icepak – Free Lunch & Learn

Introduction to ANSYS Composite PrepPost

Browse and sign up for classes directly on our website, no phone call or email needed.


 

Dynardo News

optiSLang Newsletter – 4 Quarter 2015

optiSLangNewsletterImage2015

Download Newsletter


 

Promotions

PromotionalOctober Promotional Code:

OEI1015-2000

Use the promotion code above to learn about our exclusive offers!

Every month, Ozen Engineering offers a special promotion on ANSYS products and/or training classes. Please visit our promotions page to learn more about our exclusive promotional pricing.

Learn More


Ozen Engineering, Inc. Newsletter

1210 E. Arques Ave #207

Sunnyvale, CA 94085

(408) 732-4665

www.ozeninc.com

ANSYS Channel Partner & Distributor – Ozen Engineering, Inc.

info@ozeninc.com

Ozen Engineering, Inc. provides ANSYS simulation software sales, training, technical support and consulting services.

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