by nodadmin
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by nodadmin
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Parametric analysis in Ansys simulations (Please suggest the alternate titles)
Parametric analysis is an extremely useful method in simulation. It is used to evaluate the behaviour of the simulated model with the variation in input parameters. This technique not only allow us to understand the effect of input parameters on the system, but it also helps us to study multiple simulations with different sets of variables.
The input whose effect is being studied is set as parameter within the simulation model. Then, different values of this parameter are specified, and the simulations run for each set of value(s) of the input parameter(s) without requiring change in simulation settings for each set of values separately.
In Ansys fluent, the parametric analysis can be used for three primary purposes
- Grid resolution study
- Design variation
- Operating conditions
- Design Optimization: It is used to investigate the variation in geometry. An example of design variation is shown in Figure 1. In this example the flid distribution in parallel channels is investigated. In general, fluid distributed more evenly with the increase in manifold diameter. However, manifold diameter cannot be increased infinitely. Therefore, a compromise is needed between flow distribution and manifold diameter.
For this geometry a parametric simulation is run in which manifold diameter is set as input parameter and fluid distribution at various manifold diameter is calculated. The simulation setup details are discussed in these videos:
Part1:
Part2:
- Grid resolution study: Grid resolution or mesh sensitivity analysis is an essential step in numerical simulation to ensure the reliable and accurate results. It is crucial to find a good balance between solution accuracy and the mesh refinement as higher resolution increases the computational cost significantly. In this analysis the mesh is gradually refined and its effect on the solution is observed. After reaching a certain refinement level, further resolution has a minimal impact on the simulation results. Using parametric analysis, the grid resolution study can be automated. The element size can be set as parameter in Ansys meshing and different meshes with different refinement can be generated by changing element size. Once the parametric analysis for grid resolution study has been set, all the simulation cases can be run in automated way. The details for setting up parametric analysis for grid resolution study is discussed in these videos:
Part 1:
Part2:
Part3:
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- operating parameters optimization:
Parametric analysis comes in handy when one needs to vary various process parameters ina simulation in order to reach an optimum solution. For example, one might want to study the effect of heat transfer coefficient on the cooling, or one might want to study the effect of inlet fluid velocity on simulation results. By setting up simulation case once and defining input variable as parameters, all the simulations can be run automatically. This process saves a significant amount of time and effort. Details for setting up the parametric analysis for different operating conditions is discussed in these videos.
Part1:
Part2: