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Surface Data

The Surface data result control item calculates the average or integral of the simulation variables like velocity pressure turbulence variables etc. on specified faces of the CAD model. The following types are available:

  • Area average: This function calculates the average of the field variable over the assigned face. The user can choose a number of faces to perform the operation on.
  • Area integral: This function calculates the integral of the field variable over a face. The user can choose a number of faces to perform the operation on. This integral is nothing but the summation of the product of the cell surface area and the flow variable.

$$ Area\ integral = \sum_{i=0}^n Cell\ area\ at\ the\ surface \times Flow\ variable $$

surface data results control
Figure 1: Surface data settings panel in SimScale Workbench. Area average or integral for selected faces can be computed by specifying the Write control and Write interval.

The parameters to be specified under the settings panel for surface data calculation are:

  • Write control: Control the way in which you want the results to be output
    • Time step: It corresponds to the value of Delta t in the simulation control settings panel for fluid flow analysis.
    • Synchronize with field output: The output will synchronize with other Write control types specified under simulation control for fluid flow analysis.
  • Write interval: Specify the number of Write control intervals to be skipped between two successive writes of results. For example, A write interval value of 3 for a time step length Delta t of 2 seconds means that the results will be written every 3 x 2 = 6 seconds.


Higher value of write interval will result in faster simulation. Hence, if you are mostly concerned about the converged output surface data at the end of the simulation instead of its journey then this is something to consider.

Below mentioned are some of our tutorials where you can practice the use of the surface data result control item:

Last updated: July 21st, 2021

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