1. Dept. of Mechanical Engineering, Federal Univ. of Rio Grande do Sul, Rua Sarmento Leite, 425, Porto Alegre, RS CEP 90050-170, Brazil (corresponding author).
2. Dept. of Mechanical Engineering, Federal Univ. of Rio Grande do Sul, Rua Sarmento Leite, 425, Porto Alegre, RS CEP 90050-170, Brazil.
3. Professor, Dept. of Mechanical Engineering, Federal Univ. of Rio Grande do Sul, Rua Sarmento Leite, 425, Porto Alegre, RS CEP 90050-170, Brazil.