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CFD Online top

► Spam protection problems
  31 Aug, 2018
For some time we have been running a fairly aggressive and quite good spam filter from Atomicorp. This filter blocks a lot of unwanted traffic. It is based on an add-in called ModSecurity that inspects all communication with the web-server and drops traffic that the Atomicorp rules thinks is spam.

Sometimes this can cause unexpected problems. If you all of a sudden just aren't able to reach www.cfd-online.com when trying to post a message or submit a CFD-wiki page it can be this filter that has found something it thinks is spam in your data. It then drops your data and blocks your IP number from our servers for a certain time.

If you have problems with this filter and are suddenly unable to reach www.cfd-online.com please contact us on webmaster@cfd-online.com. We can disable certain rules if they are too restrictive, but we need to know the problems to be able to fix them.

NAFEMS top

► NAFEMS World Congress 2019 Preliminary Agenda Launched
  15 Mar, 2019
NAFEMS World Congress 2019 Preliminary Agenda LaunchedQUEBEC CITY, CANADA, & GLASGOW, UK, MARCH 15TH 2019 – NAFEMS, the International Association for the Engineering Analysis, Modelling and
► Keynote Speakers announced for NAFEMS World Congress 2019
    7 Feb, 2019
Keynote Speakers announced for NAFEMS World Congress 2019The International Association for the Engineering Analysis Community Launches Extensive Roster of Keynotes for it’s Biennial World Congre
► Memorandum of Understanding between NAFEMS, prostep ivip, PDES, Inc. and AFNeT on behalf of LOTAR and CAE-IF signed 16 October 2018
    6 Feb, 2019
Memorandum of Understanding between NAFEMS, prostepivip, PDES, Inc. and AFNeT on behalf of LOTAR and CAE-IF signed 16 October 2018NAFEMS, prostep ivip, PDES, Inc. and AFNeT on behalf of LOTAR and CAE-
► 5 Reasons to Submit your Abstract for the NAFEMS World Congress 2019
    9 Nov, 2018
5 reasons to submit your abstract for the NAFEMS World Congress 2019 #NAFEMS19 1. Influence the Direction of SimulationNAFEMS is the voice of the CAE community – as simulation moves towards the
► Latest NAFEMS Publications
    1 Nov, 2018
Latest NAFEMS PublicationsThe following publications have been published recently and sent to our members.How To Perform Linear Dynamic Analysis This book aims to provide guidance on the usage of comm
► NAFEMS World Congress 2019 - Call for Papers Now Open
  30 Jul, 2018
NAFEMS are delighted to announce that the call for papers for the 2019 NAFEMS World Congress, in Quebec City, Canada, 17-20 June 2019, is now open.Engineering analysis, modelling and simulation are dy

OpenFOAM ESI-OpenCFD top

► OpenFOAM-v1812 released
    4 Jan, 2019
OpenCFD is pleased to announce the release of OpenFOAM-v1812.

This release extends OpenFOAM-v1806 features across many areas of the code. The new functionality represents development sponsored by OpenCFDs customers, internally funded developments, and the integration of features and changes from the OpenFOAM community.


Among other developments it features:
- snappyHexMesh directional stretching
- New leakage detection on geometry
- New Homogeneous Isotropic Turbulence (HIT) initialisation
- Improvements to overset
- uniformFixedValue types allow changes in time and space now
- New function object to compute AMI patch performance


... and many other developments or improvements from OpenFOAM team or contributors.


The detailed list can be found at: http://openfoam.com/releases/openfoam-v1812/


OpenFOAM-v1812 can be downloaded as:

- source code
- precompiled Docker images for Linux, Windows and Mac operating systems
- available also in the spack HPC package manager via the 'openfoam-com' package.

Details can be found on http://openfoam.com/download/installation.php
► OPenFOAM v1806 released
    2 Jul, 2018
OpenCFD is pleased to announce release of OpenFOAM-v1806. This release extends OpenFOAM-v1712 features across many areas of the code. The new functionality represents development sponsored by OpenCFDs customers, internally funded developments, and integration of features and changes from the OpenFOAM community.


Among other developments it features:
- Directional refinement of the mesh in snappyHexMesh
- New dry-run solver option for set-up check
- Improved field mapping in parallel
- New blended scheme for stabilisation
- New laser melting solver
- New swirl fan velocity boundary condition
- New In-situ processing with ParaView Catalyst
- New solvers documentation
- New fvOption documentation

Among the community contributions:
- Consolidation of moving mesh solvers
- Moving mesh functionality added to interIsoFoam
- New wave-mangrove interaction

... and many other features

The detailed list can be found at: http://openfoam.com/releases/openfoam-v1806/

OpenFOAM-v1806 can be downloaded as source code, precompiled Docker images for Linux, Windows and Mac operating systems from http://openfoam.com/download/installation.php or is available also in the spack HPC package manager via the 'openfoam-com' package.

OpenFOAM Foundation top

► OpenFOAM v6 Released
  10 Jul, 2018
OpenFOAM v6 Released

From the Release Announcement...

The OpenFOAM Foundation is pleased to announce the release of version 6 of the OpenFOAM open source CFD toolbox. Version 6 is a snapshot of the OpenFOAM development version which, through sustainable development, is always-releasable. It provides new functionality and major improvements to existing code, with strict demands on usability, robustness and extensibility.

OpenFOAM 6 includes the following key developments.
  • Conjugate heat transfer (CHT): improved usability, with simplified set up and running.
  • Rotating/sliding geometries: more robust AMI, and support for periodic cases.
  • Particle tracking: optimised computation and improved robustness.
  • Reacting multiphase models: phase change, reactions, drag, breakup, coalescence, etc.
  • Reactions/combustion: faster, full algebraic Jacobian, significant code redesign
  • Other models: water waves and films, turbulence, thermophysics, atmospheric flows
  • General: new boundary conditions, function objects, improved code compilation, etc
  • Further tools for more productive CFD with OpenFOAM.
  • Approximately 750 code commits, 350+ resolved issues
  • ISO/IEC 14882:2011 (C++11): tested for GCC v4.8+, Clang v3.7+, Intel ICC v17.0.4+.
OpenFOAM 6 is packaged for the following platforms.
The OpenFOAM 6 Source Pack can be compiled on suitable Linux platforms.

Credits

OpenFOAM 6 was produced by:
  • Core Team (CFD Direct): Henry Weller (co-founder & lead developer); Chris Greenshields (co-founder), Will Bainbridge
  • Developers/Maintainers: Bruno Santos, Francesco Contino, Mattijs Janssens (co-founder), Juho Peltola, Fabian Schlegel, Ronald Oertel, Timo Niemi
  • Patch Contributors: Tobias Holzmann, Kevin Nordin-Bates, Lorenzo Trevisan, Federico Piscaglia, Björn Pfeiffelmann, Jakub Benda, Nicolas Bourgeois, SeongMo Yeon, Stefan Hildenbrand
Licence

OpenFOAM 6 is distributed under the General Public Licence v3 by the OpenFOAM Foundation.

OpenFOAM Other Sources top

► OpenFOAM advanced training. July 22-26, 2019. Uni. Genova, Italy - Wolfdynamics
  28 Mar, 2019
OpenFOAM advanced training. July 22-26, 2019 (https://bit.ly/2WSHJHy)

We want to draw your attention to the upcoming OpenFOAM advanced training session that will take place in July 22-26, 2019. During this classroom training session we will address the following topics:
  • July 22th, 2019 - Turbulence modeling with OpenFOAM® - Theory and applications.
  • July 23th, 2019 - Introduction to solid modeling for general CFD and meshing using OpenFOAM® technology - Onshape and snappyHexMesh.
  • July 24th, 2019 - Design of experiments, space exploration, knowledge extraction, and numerical optimization using Dakota - Code coupling Dakota-OpenFOAM®.
  • July 25th, 2019 - Introduction to the FVM method, discretization techniques, and solution strategies. Standard practices in general CFD with applications to OpenFOAM®.
  • July 26th, 2019 - Open day (free for participants of the advanced training). This day (from 9:30 to 16:30), is dedicated to help participants to setup their cases. Note: Lunch is not included.

So hurry up and book your place, you are still on time to take advantage of ours reduced fees.

You can find more information in the following link: https://bit.ly/2WSHJHy

Prerequisites: intermediate knowledge of CFD, OpenFOAM®, and Linux is required. Some basic knowledge of C++ and shell scripting is beneficial. For those following the optimization training, no prior knowledge of Dakota is required.

Location: DICCA, University of Genova, (via Montallegro 1, 16145 Genova, Italy).

Course times: from 9:00 am to 5:00 pm, plus 30 minutes of Q&A.

Language: English

Number of seats: 15 places available.

Training material: every participant will get a copy of the printed lecture notes (high quality color), and an USB key with the supporting material.

Teaching method: lectures and hands-on sessions to validate the acquired knowledge.

Additional information:
  • These courses are offered in cooperation with the University of Genova.
  • The fee includes the printed material (high quality color), an USB key with the supporting material, and lunch and refreshments.
  • Attendees are not required to bring their own laptop since workstations with pre-installed software will be available.
  • A training certificate is provided to all attendees who complete the course.
► NUMAP FOAM Summer School 2019
    7 Mar, 2019
Numerical Modelling of Coupled Problems in Applied Physics with OpenFOAM
(NUMAP-FOAM) Summer School 2019
at the University of Zagreb, Croatia

http://cfd.fsb.hr/numap

Faculty of Mechanical Engineering (www.fsb.unizg.hr), University of Zagreb, Croatia (www.unizg.hr), announces the 14th edition of the School on Modelling of Coupled Problems in Applied Physics with OpenFOAM (NUMAP-FOAM) for graduate students and young researchers in Zagreb in August 2019. The Programme Chairs are Professor Hrvoje Jasak and Professor Zeljko Tukovic.


Description

The School aims to provide tuition at expert level for a small and selected group of students and researchers in academia and industry. The idea of the NUMAP-FOAM School is to expand the physical modelling knowledge, numerics and programming skills of attendees using OpenFOAM in their research through direct supervision and one-to-one project work. Lectures on chosen topics of mathematical and numerical modelling pertinent to coupled problems in engineering and applied physics will be delivered in addition. For further references, please contact the organisers or one of more than 170 alumni of previous editions of the School.

To ensure quality of work and individual supervision, the number of places is strictly limited.


Place and Time

The Summer 2019 edition NUMAP-FOAM shall take place between Monday 19 August and Friday 30 August 2019, inclusive (10 working days). The School shall be held at the Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lucica 5, Zagreb, Croatia.


Topic Areas

Students are invited to propose their own topics for the School. Preference shall be given to project which require complex programming in OpenFOAM, advanced software design and implementation of complex and coupled physical models in OpenFOAM. Special topics for this year's Summer School are fluid-solid interaction, modelling of solidification phase change and Discontinuous Galerkin Discretisation.


How to Apply: NUMAP-FOAM Summer School 2019

To apply, please write a one-page description of the project you wish to work on, with current problems and goals to be achieved at the School. Application is open to all students on graduate University courses, as well as researchers in companies and government organisations with sufficient knowledge of OpenFOAM.

Please note this is NOT an introductory OpenFOAM course: significant understanding of the project and software is a pre-requisite for application.

Deadline for application is 1 May 2019. Successful candidates will be informed within three weeks of closing.


Accommodation and Costs

Attendees to the School should plan to cover their travel and accommodation expenses, ideally bringing a laptop computer with them. A registration fee for the School is EUR 2000 per attendee.


Contact Details

For further details and submission of project proposals, please contact prof. Hrvoje Jasak at hrvoje.jasak@fsb.hr. For local organisational details please contact NUMAP-FOAM Secretary Mrs. Silvana Skoko-Gavranovic at silvana.skoko-gavranovic@fsb.hr.
► OpenFoam virtual course at the University of Granada, Spain
    1 Mar, 2019
OpenFoam virtual course at the University of Granada, Spain.

The proposal focuses on a course of basic and intermediate management of numerical simulation of fluid problems, with practical interest in engineering and science.

A structure is proposed in 5 weeks. In total there are 20 hours of video, 15 hours of questionnaires and 15 hours of final workshop with a review system.

The modality chosen for this course is virtual. Therefore, it has the characteristics of a course of this type. It allows the student complete flexibility, in terms of how to organize their time to view the explanatory videos and perform the different tasks and workshops that are proposed.

More information at: https://cemed.ugr.es/curso/19gr05/

Price: € 110
Start: March 4, 2018
► OpenFOAM Discord Chat
  21 Feb, 2019
Hi!


Have you wanted to chat (text and/or voice) about OpenFOAM with like-minded people? We have created a Discord server dedicated to OpenFOAM, using and developing with the library, events on OpenFOAM Technology and whatever you want it to be. Everybody is welcome and feel free to join us on https://discord.gg/drRaHwy.
► DANSIS OpenFOAM seminar on 27 March in Copenhagen, Denmark
  20 Feb, 2019
The Danish Society for Industrial Fluid Dynamics (DANSIS) hereby invites you to a 1-day OpenFOAM seminar at the Copenhagen Campus of Aalborg University.

The day will include a good mix of Danish and international speakers from industry and academia.

For more info and registration, see here: http://dansis.dk/seminars/2019-2/openfoam/

Hope to see you there!
► Classroom OpenFOAM introductory training. July 8th - 12th, 2019. Genova, Italy.
  10 Feb, 2019
Classroom OpenFOAM introductory training. July 8th - 12th, 2019. Genova, Italy. (https://bit.ly/2hvNdaf)


This course is offered in cooperation with the University of Genova and Wolfdynamics (http://www.wolfdynamics.com). The course last five days, which we think is the minimum time needed to introduce all the concepts of OpenFOAM® as a general CFD and multiphysics solver, advanced subjects, and the CAD/Meshing/Visualization tools.

This training is aimed at those with little or no experience in the use of OpenFOAM®, or those who want to improve their skills using OpenFOAM®. During the lectures, the attendees will be introduced to all aspects of OpenFOAM® as a general-purpose CFD solver, from structure and organization of the library, to setting cases, to assessing the convergence, to basic programming. Additionally, a few sessions will be dedicated to solid modeling, mesh generation, and visualization using open-source tools.

During this training, we also cover the following advanced physics topics; turbulence modeling, multiphase flows, heat transfer, moving bodies, source terms, and the finite volume method.

Hands-on sessions will be organized, where the participants will have the opportunity to solve predefined cases (or their own cases) with the assistance and guidance of the course trainers.


Prerequisites: no prior knowledge of OpenFOAM®, C++ or Linux is required. However, a basic knowledge of Linux is beneficial. A basic knowledge of CFD is also desirable.

Training material:
every participant will get a copy of the printed lecture notes and a USB key with the supporting material.

Teaching method: lectures and hands-on sessions to validate the acquired knowledge. A training certificate is provided to all attendees who complete the course.

Additional notes: attendees are not required to bring their own laptop since workstations with pre-installed software will be available. The inscription fee includes lunch and refreshments.


For more information, visit the following link https://bit.ly/2hvNdaf


Hurry up and get your seat right now to take advantage of the early registration discount.

OpenFOAM Wiki top

► FireFoam
  22 Apr, 2019

Equations Fluid

Show changes
► Main Page
  17 Apr, 2019

Alert about the upcoming downtime of the Wiki-Server

← Older revision Revision as of 20:34, 17 April 2019
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On the 24th of April 2019 the server will be (physically) moved to a new location. It will not be available during that time and unfortunately there will be no replacement server. The expected downtime will be from 8:00 CEST to 14:00. Sorry for any inconvenince this may cause
 
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<!-- <div style="font-size:111%; border:solid 2px; margin:0; padding:.1em; background:#f99;">It seems that some domains do not accept mails from the Wiki software. This is being investigated. If you don't get confirmation mails for passwords or so, please contact me [http://www.cfd-online.com/Forums/openfoam/60855-wiki.html here].</div> -->
 
<!-- <div style="font-size:111%; border:solid 2px; margin:0; padding:.1em; background:#f99;">It seems that some domains do not accept mails from the Wiki software. This is being investigated. If you don't get confirmation mails for passwords or so, please contact me [http://www.cfd-online.com/Forums/openfoam/60855-wiki.html here].</div> -->
► FireFoam
  17 Apr, 2019

Equations Liquid Film

← Older revision Revision as of 15:52, 17 April 2019
(One intermediate revision by the same user not shown)
Line 337: Line 337:
 
<center><math>
 
<center><math>
   
\nabla \cdot \rho  \bold {U_p} \delta =  
+
\rho \nabla \cdot   \bold {U_p} \delta =  
\nabla \cdot \rho  \left [ \bold {\frac { \bold { H[U] }}{A_P}} -  \bold {\frac {\delta}{A_P}} \nabla \left (  {P_p} \delta - {P_u}  \right )  +  {\frac {\delta}{\bold A_P}}\rho  g_t  \right ] \delta
+
\rho \nabla \cdot   \left [ \bold {\frac { \bold { H[U] }}{A_P}} -  \bold {\frac {\delta}{A_P}} \nabla \left (  {P_p} \delta - {P_u}  \right )  +  {\frac {\delta}{\bold A_P}}\rho  g_t  \right ] \delta
   
 
</math></center>
 
</math></center>
 
</td><td width="5%">(6)</td></tr></table>
 
</td><td width="5%">(6)</td></tr></table>
  +
  +
After applying the chain rule:
  +
  +
<table width="70%"><tr><td>
  +
<center><math>
  +
  +
\rho \nabla \cdot  \bold {U_p} \delta =  \rho  \bold {U_p} \cdot \nabla  \delta +  \rho  \delta \nabla
  +
\cdot  \bold {U_p} = \rho  \left [ \bold {\frac { \bold { H[U] }}{A_P}} -  \bold {\frac {\delta}{A_P}} \nabla \left (  {P_p} \delta - {P_u}  \right )  +  {\frac {\delta}{\bold A_P}}\rho  g_t  \right ] \cdot \nabla \delta +
  +
\rho \nabla \cdot  \left [ \bold {\frac { \bold { H[U] }}{A_P}} -  \bold {\frac {\delta}{A_P}} \nabla \left (  {P_p} \delta - {P_u}  \right )  +  {\frac {\delta}{\bold A_P}}\rho  g_t  \right ] \delta
  +
  +
</math></center>
  +
</td><td width="5%">(7)</td></tr></table>
  +
  +
It is evident that the above equation still represents a non linear equation for the film thickness  <math> \delta </math>. In order to solve the above equation, it has to be linearized and an iterative algorithm has to be applied. 
   
 
And finally:
 
And finally:
► User talk:CyHuang
  17 Apr, 2019

Welcome!

New page

'''Welcome to ''OpenFOAMWiki''!'''
We hope you will contribute much and well.
You will probably want to read the [[https://www.mediawiki.org/wiki/Special:MyLanguage/Help:Contents|help pages]].
Again, welcome and have fun! [[User:Bgschaid|Bgschaid]] ([[User talk:Bgschaid|talk]]) 16:41, 17 April 2019 (CEST)
► User:CyHuang
  17 Apr, 2019

Creating user page for new user.

New page

I am Phd student in TU Dresden, Germany. We will investigate the interaction between particles and fluid, especially in combustion chamber. I prefer OpenFOAM because it is more flexible. I have also experience of coding control volume upwind method in the graduate school, so it will be much easier by using OpenFOAM if I need additional equation to describe flow field.
► User:CyHuang
  17 Apr, 2019

User account CyHuang was created by Bgschaid


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