QUIZ 1

Select the WRONG statement

• 3D model is the most accurate

• 2D model is suitable for coastal area

• 1D model is suitable for rivers

• Cost of computation increase with dimensionality

Select the WRONG statement

• Numerical model should give reasonable accuracy

• Numerical model should be stable and robust

• Numerical model should be checked against laboratory or field data

• Numerical model consider all physical processes

Select the WRONG statement

• Source code are free numerical model

• Results from different software is usually due to user setting

• University can develop own numerical model using coding

• Commercial software is generally user friendly

Select the WRONG statement

• Smaller grid size give better resolution

• Irregular grid can match coastal boundary better

• Different grid sizes cannot be mixed

• Adaptive grid system choose the best grid size to use

Select the WRONG statement

• Governing equation must be discretized

• Cell solution depends on 4 neighbouring cells

• Computational domain ends with boundary cells

• Numerical solver solve the discretized equations

Select the WRONG statement

• Physical model can use different length scales for vertical and horizontal

• Length scale depends on domain to model and space available

• Model size must be smaller than prototype

• Length scale adopted should produce practical model size to construct

Select the WRONG statement

• Reynolds similarity is used for pressure flow

• Froude similarity is used for free surface flow

• Dimensionless group is the ratio of two similar physical quantities

• Dimensionless group is used to simplify calculation

Select the WRONG statement

• Geometrical similarity scale length

• Kinematic similarity scale velocity

• Dynamic similarity scale force

• Temporal similarity scale time

Select the WRONG statement

• Physical model can use the same fluid

• Physical model may use the same material

• Physical model is usually difficult to modify after construction

• Physical model must be tested until fail

Select the WRONG statement

• Physical model of coastal area requires bathymetry and topography data

• Physical model of coastal structures requires design drawing

• Physical model of estuary requires mixture of sea water and fresh water

• Physical model of river flow requires pumping facility