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How to Select & Define Goals for SOLIDWORKS Flow Simulation Convergence 1/13

Select & Define Goals for SOLIDWORKS Flow Simulation Convergence

SOLIDWORKS Flow Simulation uses Goals-Based Convergence, a technique that focuses the finishing criteria for the solver on what is important to you and your study. Computational Fluid Dynamics (CFD) solvers are iterative, meaning the initial temperatures and pressures are modified and measured repeatedly until energy is balanced across the entire domain. General convergence criteria may let the solver run for longer than necessary or stop before full convergence is reached. It works by defining specific measurable goals for the solver, which provides numerical feedback to you during the solve as well as indicates to the solver if the parameters of interest have fully achieved the final answer.   

Types of Goals

Goals can be specified in the same ways as boundary conditions or any other definitionPoint, surface, volume, or global goals make it easy to select the value of interest and the measurement zone to accurately check for issues or mimic real measurements or sensorsMaximum, minimum, average, or bulk average measurements will monitor the specific performance you care about. 

How to Select Goals

Selecting goals often involves predicting potential failure modes and creating goals that will be sensitive to those valuesIn the case of this enclosure, the maximum temperature of the solid components represents a very good goal to check for failure of the components under steady-state operation, and won’t stop the solver until those values are converged and accurate for this studyMaximum velocity is sensitive to the free convection that is expectedSolid temperatures and free convection behaviors rely on each other, so until both have reached a final answer, the study will keep working. 

Recommended Goals

If you are having trouble thinking about goals or want a good simple recommendation, try these goal suggestions that are useful for ensuring general study convergence in addition to your specific values of interest: 

 

    • With a prescribed Flow Rate, set a static pressure goal at the inlet and outlet. 
    • For a pressure drop, use a flow rate goal through the lids. 
    • When power is being transferred to/from a fluid such as an impeller, apply pressure conditions to the impeller surfaces. 
    • For thermal studies, use temperature goals on component volume. 
    • For cavitation, create a goal that is sensitive to cavitation, such as density or mass fraction of water. 

Final Thoughts

Keep in mind that goals are simply a guide for the solver to optimize your time and resources.  If needed, stopping criteria can be set manually or turned off to allow it to solve until you manually stop itIf you add new goals based on the first set of results, continue the solve and it will incorporate the new parameters and solve until they are also converged. 

Technical Support

Get help from our team by Calling us at 800-364-1652 x 2. You can also get assistance by clicking the Technical Support button or the Email Our Experts button below. 

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