In an earlier bog, I have developed an ACT extension for harmonic base excitation using the enforced motion method EMM. That blog demonstrated three different techniques of applying base excitation in harmonic analysis, and the EMM using the developed ACT extension proved to be the most efficient, easy to use, yet the most accurate technique.
Today, I am updating the extension to also account for transient analysis. The extension now supports the application of displacement and acceleration base excitation in time-history (i.e., transient) analysis. The EMM is supported only in mode-superposition analysis which would then allow for a faster and less expensive analysis than either the reduced or the full method for many problems.
The time dependent excitation (displacement or acceleration) can either be directly input in a tabular form, or read from a file. Continue reading
In my last blog, I discussed the difference between HBM nCode DesignLife and ANSYS nCode DesignLife. I explained how ANSYS nCode DesignLife is fully featured, but integrated into the Workbench environment to provide state-of-the-art CAE fatigue analysis capabilities along with the ease of use features of Workbench. In this blog I will discuss the basic workflow of an ANSYS nCode DesignLife simulation.
Early in your exposure to ANSYS nCode DesignLife, you will probably hear the term “the 5-box trick” and wonder, what does it mean? Essentially, the term 5-box trick is used to succinctly describe the basic steps of an ANSYS nCode DesignLife workflow. The multiple actions required in most ANSYS nCode DesignLife simulations can be summarized into five general categories (i.e., 5-boxes). Continue reading
The Remote Solve Manager (RSM) is a convenient utility allowing users to submit analyses to solve on a separate machine or even a cluster. However, RSM can also be used locally, and one of several benefits is the ability to review results of nonlinear analyses during solution.
Nonlinear analyses can require hundreds of iterations and take hours to complete. A user may wish to track the progress of the model while it is solving, so if anomalies are present, the user can stop the solution to correct the problem rather than wait until the job is completed to find out, for example, that a boundary condition was not defined correctly.
While Workbench Mechanical provides a very useful “Results Tracker” functionality to monitor specific output during solution, such as the number of elements in contact within a region, the user must select these items a priori, and the monitoring information does not include a snapshot of the entire model. Consequently, the ability to review contour plots of the converged results while the solution is in progress can be quite helpful to the analyst. In order to do this, RSM must be used. Continue reading
Stress in a bladed disk
Turbomachinery — turbochargers, compressors, jet engines, gas turbines, pumps, etc.— are subjected to some of the harshest environments for an engineered product. High rotational velocities and extreme temperatures and pressures produce high static stresses. Couple on top of that the vibrations encountered due to the fluctuating and turbulent flow field, rotating turbomachinery components are primed for high-cycle fatigue (HCF) failures.
Traditionally, cyclic modal analyses are used to extract the vibrational modes and the appropriate modes from Campbell and interference diagram assessments are scaled based on past test data to arrive at estimates of the vibratory stresses for a fatigue analysis. Continue reading
Are you happy with the way you access HPC resources? Some time back, I spoke with one of our customers about his daily experiences with his company’s HPC environment. He told me that the procedure to access the resources and dealing with the sessions is cumbersome and difficult to understand, especially for new employees.
I replied that ANSYS 15.0 comes with a solution for launching and managing batch jobs and remote visualization sessions based on a Web front end. That resonated well with my counterpart, such that the conversation evolved into a more detailed discussion on the individual features of the solution.
After the conversation, I was sharing my experience with some colleagues. We agreed that being able to quickly demonstrate the above mentioned features is essential for being able to communicate the advantages. However, as you can imagine, deploying such a tool is not done with the installation of the software, but requires some configuration, such as hooking up the submission tool with the compute resources. Even if the configuration step is designed to be comfortably done through the Web GUI itself, it will take some time until customers will be able use the tool and collect their own experiences. Continue reading
Since ANSYS 8.1, our software has included the option for including nodal velocity and nodal acceleration results on the results file for structural full transient analyses. The *VGET command has had the capability to retrieve the nodal displacement data while in POST1 and there has been a *GET command to get a single nodal velocity or nodal acceleration. Getting a vector of the nodal velocity or nodal acceleration required using a do loop to cycle through either the set of nodes or set of results. The NSOL command in POST26 does provide one method to get the nodal velocity or nodal acceleration data.
Starting with ANSYS 14.5, the *DMAT and *VEC commands, which are part of the APDL Math commands, give user’s access to the nodal velocity and nodal acceleration data on the results file. The other APDL Math command needed to create the desired vector of results is the *EXPORT command. On the *DMAT command the second field is the matrix name, third is D, fourth is IMPORT, fifth is RST sixth is the complete result filename, seventh is the starting dataset number, eighth is the ending data set number, and ninth is either NSL for nodal displacement solution, VSL for nodal velocity solution, or ASL for nodal acceleration solution. The *EXPORT command uses the matrix name as the second field, APDL as the third, name of the array parameter in the fourth, the beginning column number in fifth, and the ending column number in sixth.
I started with a test case and added a macro to get a vector of the results for a specified node in a specific direction. The printed solution output provides the results needed to check the macro operation. The matrix format for this 2D four node model is: Continue reading
In my last blog, I highlighted that HBM nCode is the world-wide leading developer of CAE durability software. They develop HBM nCode DesignLife, which is the leading FE based fatigue analysis software product. I discussed how ANSYS, Inc and HBM nCode partnered to develop the ANSYS, Inc supported ANSYS nCode DesignLife product. Thus, two variations of DesignLife are now available to ANSYS customers — HBM nCode DesignLife and ANSYS nCode DesignLife. Both versions have identical core capabilities, so what’s the difference between ANSYS nCode DesignLife vs. HBM nCode DesignLife?
The answer is Workbench!
HBM nCode DesignLife is a standalone product that is a good solution for a wide range of CAE tools. ANSYS nCode DesignLife is data integrated into the Workbench environment enabling it to provide state-of-the-art CAE fatigue analysis capabilities along with the ease of use features of the Workbench environment. This integration highly optimizes the workflow for ANSYS users. Some of the benefits of this Workbench integration are: Continue reading
Now that ANSYS 15.0 is released the next thing many of you will be doing is downloading and installing the new version.
NOTE: This blog is aimed at current customers. If you’re not a current customer you might want to tune out now and watch for tomorrows blog!
We’re providing several materials to help you to successfully get through this process so you can get on with using the new functionality in ANSYS 15.0!
When you go to the customer portal to download the software you will notice that you are taken to a Getting Started page. This page contains the information you should need to install the products successfully. We recommend that you pay special attention to the installation section which contains video’s and documentation links that can guide you through the process. Continue reading