液体晃荡压力分布规律OpenFOAM模拟研究

Study of sloshing pressure distribution rules simulation using OpenFOAM

利用振动台试验数据对基于开源程序OpenFOAM建立的液体晃荡模型进行了验证.利用验证后的数值模型研究了液体深度与液舱长度比为0.15和0.33两种工况下,矩形液舱在不同频率下的液体晃荡压力分布规律.冲击压力最大值及其均方差对频率的响应曲线显示液体深度与液舱长度比为0.33时比0.15时更容易发生剧烈的晃荡现象.不同液体深度的晃荡冲击压力对频率的响应曲线呈现不同的规律:对浅水晃荡来说,压力最大值随着频率的增大先缓慢增大后快速减小;对有限水深晃荡来说,压力最大值随着频率的增大先快速增大后缓慢减小.晃荡压力沿舱壁的垂向分布规律表明最大冲击压力位于自由液面稍上处,并且位于最大冲击压力位置之下的压力沿舱壁的分布规律均可以拟合为二次多项式形式.

A developed sloshing model based on open source code OpenFOAM is validated against with shaking table experimental data. The sloshing pressure distribution rules in rectangular tank at different frequencies under the conditions of 0.15 and 0.33 of liquid depth to tank length ratio are studied by using the developed numerical model. The response curve of the maximum impact pressure and its mean square deviation to frequency shows that 0.33 of liquid depth to tank length ratio is more likely to cause violent sloshing than 0.15 of liquid depth to tank length ratio. There are different rules for response curve of sloshing pressure to frequency under different liquid depths. The maximum pressure increases slowly first and then decreases rapidly with increasing frequency for shallow water sloshing. However, the maximum pressure increases rapidly first and then decreases slowly with the increase of frequency for finite water depth. The vertical distribution of the sloshing pressure along the bulkhead shows that the maximum impact pressure is located slightly above the free surface and the pressure distribution rule along the bulkhead below the location of the maximum impact pressure satisfies the quadratic polynomial form.