The temperature distribution on a rotating wafer heated by a moving heat pulse.

(For more details, check out the tutorial model.) In this case, we want to modify the model such that the computation stops when a threshold temperature is reached. (We can also use different conditions, but the procedure remains the same.)Ĭonsider a silicon wafer heated by a moving heat pulse and cooled via radiation to the surroundings. We will tell the software to stop the computation when the maximum temperature exceeds a threshold value. To demonstrate how to set up a stop condition, let’s look at a time-dependent heat transfer problem. Using Stop Conditions in Time-Dependent Solvers The condition has to be a statement that evaluates to true or false. The second step is adding a stop condition to the solver configuration. In the software, we can define this using a point probe or a component coupling. This scalar can either be a quantity defined at some point of interest or a global quantity, such as an integral, maximum value, minimum value, or average of a variable over domains or boundaries. The first step is to define a scalar that we can use in a relational or logical expression.

Stationary solver with a parametric or auxiliary sweep.

In COMSOL Multiphysics, a stop condition can be added to the following solvers: As for computational issues, one example is a very small time step size taken by the solver. Examples of such physical conditions include allowable stresses, temperature limits, and species depletion in reactions. Physical conditions or computational issues can trigger a stop. We then add a stop condition to terminate the solver. In this case, we need to specify a solution time or parameter range large enough so that we are reasonably certain that the stop condition is going to be activated. But we usually do not know the exact time or parameter value at which the stop condition is going to occur. We often want to stop a time-dependent or parametric solver when a certain condition is met or violated. Stop Conditions: When and How to Use Them We also have the option to see what happens the first time the conditions are violated. This way, we can work on something else while the software checks the conditions after each step. In this blog post, we discuss how to automate this process in the COMSOL Multiphysics® software. This can leave us staring at the monitor, ready to pounce. Sometimes a simulation runs longer than needed, not giving us a way to monitor intermediate results or stop conditionally.

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