Numéro : 2263 - Year : 1995

Numerical and experimental study of the water flow in trawls. (Water flows bounded by a porous and axisymetric surface)

B. VINCENT, IFREMER -Lorient
D. MARlCHAL, Ecole Centrale de Nantes

This work fits into a global improvement project of fishing gears selectivity like trawls. The selectivity of a fishing gear is its capacity to leave young fishes escape through meshes. Our goal is to improve our knowledge about meshes geometry in codend where selectivity especially works. To be able to calculate meshes geometry we need to know water speed in the trawl. Indeed, meshes geometry depends on hydrodynamic forces due to the flow. The study is restricted to codend where variations of water speed are more important. We use the Navier-Stoke equations to solve the problem. These equations are not solved around each wire of codend, because it is technically impossible. Then codend is supposed to be an homogeneous and porous surface. We add to these equations a turbulent model based on a mixing length. At last, we compare numerical results and a first serial of experiences made in a flum tank.

Advanced search

Year

2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959 1958 1957 1956 1955 1954 1953 1952 1951 1950 1949 1948 1947 1946 1945 1939 1938 1937 1936 1935 1934 1933 1932 1931 1930 1929 1928 1927 1926 1925 1924 1923 1915 1914 1913 1912 1911 1910 1909 1908 1907 1906 1905 1904 1903 1902 1901 1900 1899 1898 1897 1896 1895 1894 1893 1892 1891 1890

Download (only for members)