Similitude And Model Analysi213123ental.docx

Similitude and Model Analysis  Similitude is a concept used in testing of Engineering Models.  Usually, it is impossible to obtain a pure theoretical solution of hydraulic phenomenon.  Therefore experimental investigations are often performed on small scale models, called model analysis.  A few examples, where models may be used are ships in towing basins, air planes in wind tunnel, hydraulic turbines, centrifugal pumps, spillways of dams, river channels etc and to study such phenomenon as the action of waves and tides on beaches, soil

 Model Analysis  Model Analysis is actually an experimental method of finding solutions of complex flow problems.  The followings are the advantages of the model analysis  The performance of the hydraulic structure can be predicted in advance from its model.  Using dimensional analysis, a relationship between the variables influencing a flow problem is obtained which help in conducting tests.  The merits of alternative design can be predicted with the help of model analysis to adopt most economical, and safe design.  Model Analysis  Model Analysis is actually an experimental method of finding solutions of complex flow problems.  The followings are the advantages of the model analysis  The performance of the hydraulic structure can be predicted in advance from its model.  Using dimensional analysis, a relationship between the variables influencing a flow problem is obtained which help in conducting tests.  The merits of alternative design can be predicted with the help of model analysis to adopt most economical, and safe design.  Q. A river model is to be constructed to a vertical scale of 1:50 and a horizontal of 1:200. At the design flood discharge of 450m3/sec, the average width and depth of flow are 60m and 4.2m respectively. Determine the corresponding discharge in model and check the Reynolds’ Number of the model flow. 