Numerical simulation techniques of physical behaviors of a string drawn out of a yarn feeder in a weaving/braiding machine are disclosed. A FEA model, representing a string having a source end at yarn feeder and a braiding end towards braiding/weaving operations, contains at least one truss element with a leading element directly connected to the source end at which pull-out force of the yarn feeder is predefined. Maximum and minimum lengths of a truss element are predefined for facilitating local remeshing. Simulated physical behaviors of the string are obtained by performing a time-marching simulation using the FEA model with the FEA application module having local remeshing capability. Simulated physical behaviors include axial forces in each truss element of the FEA model and the string's deformed geometry. Local remeshing is used for updating the computerized model by creating new leading element that satisfies consistent realistic condition, when local remeshing becomes necessary.