Hello,

What is “**travel**”’s exact definition?

According to help this is defined to be “number of iterations for a ** disturbance** to

**the computational domain’s**

*cross***”.**

*fluid region*

Therefore it is something similar in nature to “time”, and in order to calculate this one must know the corresponding concept of “speed” and “distance” in the context.

But for flow simulation how could “speed” be known a priori? The flow might undergone different path depending on the geometry of the container (pipe, channel, etc.) and boundary and initial conditions, and its exact path can only be expected as a result from the simulation, but not a predictable value before running simulation. But in running the tutorial’s “**conjugate heat transfer**” example, I did find that:

- After a total of 128 iterations,
**Travel**is determined to be 91 - Re-run, and upon start,
**Travel**is determined to be 90 as early as the 4^{th}iteration.

How is it determined before running? What is “** disturbance**” and “

**”? Why its values could be different at beginning and after finishing?**

*cross*

Jerry

Hi Jerry, have you checked the SolidWorks KB, the solving engineering problems document and the technical reference? There are several more articles/descriptions about it. There have also been several discussion about on this forum and others.

What is your specific concern about this parameter?

The reason I ask is that from a user perspective, it is really not necessary to fully understand the mathematical definition of it. Nor does it affect the way you perform your solutions or evaluate the convergence of your solutions. It is simply another parameter that could be used to compare similar solutions or control a solution. For example you may ask the software to use the solution adaptive method X number of travels vs iterations.