This is a standalone part of OpenRadioss that performs the collision detection on a given dataset

Usage

Step 1: Build the Data File

To build the data file, run the following commands:

cat t10m.dat.tgz.part* > t10m.dat.tgz
tar -xzvf t10m.dat.tgz

Step 2: Build and Run

Choose the appropriate compiler and execute the following commands:

• For NVFortran:

  make COMP=nvfortran run

• For GFortran (default):

  make COMP=gfortran run
  # or simply:
  make run

• For Intel:

  make COMP=intel run

Step 3: Check the Results

After running the program, the expected output should be:

Success: All candidates_ref are found in candidates.

Code

The entry point of the program is the routine INTER7_CANDIDATE_PAIRS located in the file inter7_candidate_pairs.F. This routine contains the collision detection algorithm for /INTER/TYPE7 (in a somewhat simplified form).

Key concepts

This routine handles the broad phase of the collision detection algorithm. Its purpose is to identify pairs of main quadrangles and secondary nodes that are within a specified distance of each other.

The 3D coordinates of all nodes are stored in the array X. A subset of these nodes, referred to as secondary nodes, is listed in the array NSV. The main surface is divided into NRTM quadrangles, with the IDs of their nodes stored in the IRECT array. It is important to note that secondary nodes may also belong to the main surface.