AskGuru Functionality - Temporarily Out of Order

Hello All,
I was trying to change some settings in the Blog and have done something wrong. Now the 'Ask Guru' Fucntionality is temporarily not availble. I will fix it as soon as possible and will inform you people.

Thanks for your understanding :)

Combine Restart Odb Files

Anonymous asks..
I am running an analysis splitted into 10 restart analyses (ABAQUS/Standard). Now the problem is I am not creating .fil file for the analysis. Is it possible to combine all the odb files into 1 single ouputfile??? is it possible thru command line or do I need to go to python scripting???

Answer :
Starting from Abaqus 6.6 a execution procedure called restartjoin can be used to join different odb files from restart analysis. The syntax is

abaqus restartjoin	originalodb=odb-file-name
	restartodb=odb-file-name [copyoriginal] [history] [compressresult]

Prior to Abaqus 6.6, this execution procedure was not available. But almost the same functionality can be availed by using example programs odbjoin.c and odbjoin.py. I use here almost the same functionality because it seems that merging of history output is not the same between the execution procedure and the example programs.

To use C program, follow these steps. ( For python program also the steps are similar, only that you dont need to compile the program and should make use of abaqus python command)

Fetch the program
abq651 fetch job=odbJoin.C

Compile the program
abq651 make job=odbJoin.C

Use the compiled binary
abq651 odbJoin -writeOdb destination.odb -readOdbs restart.odb

The above command will join the restart.odb to Destination.odb

Modelling Fluid Viscosity in Fluid Cavity

Rahul asks...
I am modeling a fluid cavity in abaqus. I need to model fluid viscosity. How can it be done?

Answer :
Fluid Cavity as such does not have Viscosity as a parameter. But if fluid is flowing from one Cavity to another then you need to use *FLUID EXCHANGE. In this keyword you can define the Bulk Viscosity.

The following is the input file implementation of it.

*FLUID EXCHANGE PROPERTY, TYPE=BULK VISCOSITY, DEPENDENCIES=n
viscous resistance coefficient, hydrodynamic resistance coefficient

Biased Meshing

Vijay asks..
I created a 3-D fixed beam(i.e. fixed at one end and free at other end) in Abaqus CAE.I want to mesh that one. But actually what I want is I want to use finer mesh for half of the beam( i.e. from fixed end) than the other half(i.e. free end)
how can we do that one?

Answer :
You can use Local Biased seed for the edges.
In Mesh Module -> Seed -> Edge Biased.

Abaqus Tutorials and Documentation

One of the questions that I am often asked by someone who is just starting to use Abaqus, is where they can find Online Tutorials, so that they can learn on their own.

The answer simply is google. I mean try googling. There are humpty number of sites, especially educational institutions, which host Abaqus Tutorials.

I just name few sites that I found by googling.

Abaqus Official Webpage itself has an assortment of Tutorials to get oneself started. You can find them at the following link.
Abaqus Academic Tutorials at Simulia Website

Another nice place to start, in my opinion, is the Tutorials section of the Abaqus Documentation. It is very comprehensive and ofcourse official. And for more complicated problems, there are these Example Users Manual and Verificiation Users Manual.

Abaqus Documentation comes along with the Abaqus Software and is copyrighted. But surprisingly, I found the documentaion online in some sites. HLRS Stuttgart was one such site with the documentation for many versions available. Very recently, public access to that site was denied.

With a little more effort and tweaking, I found the documentation on Scientific Computing and Visualisation Institute of Boston University. May be they also will deny access to the Documentation soon. For reasons of copyright problems, I refrain from posting those links.

Good luck and have fun using Abaqus.

Disclaimer
Please note that Abaqus Documentation is copyrighted and I have found these links just by googling. I have nothing to do with the posting of these documents online and therefore cannot be held responsible for any misuse of these documents.