From your project I can see that you are running a TSearch in conjunction with a Brent.
The Brent is defined in "Design Preprocessing" which means it will run before each result evaluation of Sobol. So Sobol will define the parameters assigned to it, before evaluating the result it will do an internal optimization using Brent for the parameters assigned to it.
At this point one should be sure that "Variant Creation" radio button is toggled off for Brent.
From your project what I see is, "outlet width" is the parameter while "eval_dp" is the objective extracted from the external software results file however "Variant Creation" radio button is toggled on.
While in TSearch, "Impeller_diameter" and "Number_of_Blade" are the parameters and "eval_Efficiency" is the objective extracted from the same external software results file.
Which means that for the first TSearch design, "Impeller_diameter" and "Number_of_Blade" are going to be assigned by TSearch and then without any evaluation it will switch to Brent where it will predict one value for "outlet width" and send the data to external software for evaluatuion. In Brent Number of Iterations is assigned as 10, so for the same "Impeller_diameter" and "Number_of_Blade" parameters, Brent will assign a new "outlet width" parameter and run the external software 10 times in order to reduce your Brent objective which is the "eval_dp".
After the Brent run and finally having decided on an optimized value for "outlet width", it passes to TSearch where it will try to optimize the objective "eval_Efficiency" for max 50 iterations as it is assigned so. So in total you will have in max 500 runs.
One interesting point is that because both of the objectives for Brent and TSearch are derived from the External Software output, when Brent is finished and TSearch starts, the TSearch design result will be the same as the Brent best design.
Please find attached one project that both a Brent and Sobol/TSearch is used in conjunction. You will have to download and install the free tool JavaFoil in order to be able to use it.
Can you be more clear about importing number?