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# Transient Calculation Options

Dear all,

I need to know the difference between Run Duration Type (Time/Time Steps) in Transient Calculation Options as is give me different results.

Parents
• Dear Radwa,

In both calculation options you have defined a timestep of 0.01 seconds. This means that if you set the Run Duration Type to Time (200 sec) that the simulation will run for 200 seconds with a timestep of 0.01. This leads to a total of 200 / 0.01 = 20000 timesteps. If you set the Run Duration Type to Time Steps (200 Time Steps) the simulation will run for 200 time steps, this leads to an equivalent runtime of 200 x 0.01 = 2 seconds. The timescales of these simulations are vastly different, one being much shorter than the other. If you zoom in on the results of the Run Duration Type (Time) results, the first 2 seconds (200 Time Steps) should be similar to the Run Duration Type Time Steps simulation.

Answer Verified By: Sushma Choure

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• Dear Radwa,

In both calculation options you have defined a timestep of 0.01 seconds. This means that if you set the Run Duration Type to Time (200 sec) that the simulation will run for 200 seconds with a timestep of 0.01. This leads to a total of 200 / 0.01 = 20000 timesteps. If you set the Run Duration Type to Time Steps (200 Time Steps) the simulation will run for 200 time steps, this leads to an equivalent runtime of 200 x 0.01 = 2 seconds. The timescales of these simulations are vastly different, one being much shorter than the other. If you zoom in on the results of the Run Duration Type (Time) results, the first 2 seconds (200 Time Steps) should be similar to the Run Duration Type Time Steps simulation.

Answer Verified By: Sushma Choure

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