This step is actually common to a certain number of different applications. The instruction mentioned in this page are completely defining all these applications, even though some limitations may occur in some of them, consisting in a reduced number of possible choices availability.
The first section someone has to define in a static mechanical simulation regards the mechanical model. This is a system of hypothesis that link calculated displacement with stress and shear. The models available are:
For each of the choices made in the mechanical model, it is then necessary the definition of the material properties such as:
In this section it is possible to insert a body force, a force acting on the whole volume we are simulating. Among the possible choices you have:
Similarly to what happens in CFD simulations, it is now necessary to insert a mixed of boundary conditions in order to define the external loads and constraints. To do so, CONSELF web applications gives you the opportunity to use the following boundaries:
Before running a MECH simulation make sure you are limiting al possible liabilities in all directions. If this condition is not satisfied you are going to get an error from the application.
In simulation settings the user interface requires a set of numerical parameters. In particular:
The iterations number, and consequently, the output frequency are useful parameters when dealing with non-linear simulations. A higher number of iterations helps the solver to achieve a complete level of convergence.
Since MECH analysis can be non-linear (i.e. large displacement analysis), the FEA assumes an iterative process to calculate the results. As usual, it is possible to monitor real-time the residuals calculated after each iteration by clicking on the appropriate button of the progress bar.
The residual plot consists of two different graphs: the top one represents the residuals of the algebraic method to solve the linear system of equations whilst the bottom one is the number of inner iterations made to achieve the level of residuals. In a correct analysis the residuals should always be below 10^-6, whilst the inner iterations number can be up to 20.
CONSELF is constantly producing more and more tutorials and guidelines to users so they can get benefits out of CFD/FEM simulations. In particular, referring to MECH analysis, you can find a certain number of posts by visiting this page.