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Result Control

Result control allows users to define extra simulation result outputs. This can be a specific solution field like vorticity, calculation of forces and moments on the facade of a monument due to wind in a wind comfort simulation, or areas of high stress in a structural analysis.

The user can find the result control item inside the simulation tree. A general explanation of the result control settings for each type of analysis in SimScale can be seen below:

Fluid Flow Analysis

Users can find the following Result control settings for OpenFOAM® based analysis:

available result controls in a cfd analysis which includes forces and moments, surface data, probe points and field calculations
Figure 1: List of result control items in a CFD analysis
  • Forces and moments: Calculates the forces and moments on a specific surface. This is used, for example, when one wants to find the drag and lift coefficient of a car surface in the aerodynamic analysis.
  • Surface data: Calculates average or an integral sum of the simulation results on a specified surface area.
  • Scalar transport: This result control enables you to insert a passive scalar into your model to act as a tracer. Moreover, you will need to define the diffusion coefficient and the source of the scalar quantity with a geometry primitive.
  • Probe points: One can place points for the measurement of the flow variables inside the model. Users can define the probe points by creating point geometry primitives and setting the coordinates of those points.
  • Field calculations: The user can enable additional calculations in the flow domain to explore flow characteristics. The calculations that can be done are pressure fields, turbulence, vorticity, and wall shear stress. If you need to compute pressure coefficients, then this the place to be.

Structural Analysis

The Result control settings for structural analysis based on Code_Aster can be seen below:

available result controls in a structural analysis which includes solution fields, edge calculation, area calculation, volume calculation and point data
Figure 2: List of result control items in a structural analysis
  • Solution fields: Here quantities like displacements, strain and stress types, reaction forces, can be set for calculation.
  • Edge calculation: Calculates statistical data of a chosen parameter on an edge. For example, the average displacement on an edge in the x-direction.
  • Area calculation: This gathers statistical data of a surface in the model. For example, the minimum and maximum values of velocity in the y-direction.
  • Volume calculation: Statistical data for a volume. For example, the sum of forces and strains in the z-direction or all directions.
  • Point data: This is similar to probe points in CFD analysis where the user can define points that will be measurement points for the simulation.

To know more about the result control settings for structural simulations interested readers are requested to visit this document.

LBM and PWC

Professional users can find the Result control settings for the LBM and PWC analysis in the list below:

available result controls in a pwc analysis which includes forces and moments, probe points, field calculations, transient output, statistical averaging and snapshot
Figure 3: List of result control items in LBM analysis
  • Forces and moments: Calculates the forces and moments of a specific surface. For example, you can enable this when you want to observe the wind load on a building surface facing the predominant wind direction.
  • Probe points: One can place points to use as measurement points in the model. Moreover, the user can enable this if there are particular areas of interest that need attention.
  • Field calculations: Additional calculations that are done in the domain of the simulation. You can add additional calculations for vorticity, friction velocity, or surface normals.
  • Transient output: One can export the transient output of the whole or a fraction of the simulation by controlling the write frequency. Both flow-domain and surface fields can be exported.
  • Statistical averaging: The user can change the settings of how the statistical averaged results are exported and the settings are similar to that in the transient output. However, instead of a transient set of results, they will be averaged into one result.
  • Snapshot: Simulation results from the last time step of the simulation are shown as a snap. It is also important to remember that this is only available for PWC simulations. The domain of the snapshot can be the same domain as the region of interest or can be defined by a geometry primitive.

Detailed information on the results of LBM simulations can be found here.

Last updated: November 26th, 2020

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