steady state CFD simulation on basic shapes and calculate Cd value
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The document outlines a student assignment focused on performing steady state CFD simulations on basic shapes (square, triangle, and vertical plate) to calculate drag coefficient (cd) values at an inlet velocity of 80 m/s. It details the mesh and solver settings used in the simulations, displaying errors between reference and simulation cd values across three problem statements. The results show increasing errors from 14% to 30% compared to reference values found in a fluid mechanics textbook.
steady state CFD simulation on basic shapes and calculate Cd value
- 1. www.engineeringwithsandeep.com| Student Assignment Assignment No. 6 steady state CFD simulation on basic shapes 14.04.2021 Shivam Choubey Student No: CFDB30321004
- 2. www.engineeringwithsandeep.com| Student Assignment Objective • Perform a steady state CFD simulation on shapes and calculate value of 𝐶𝑑. Shape used: Square Shape Triangle Shape Vertical Plate
- 3. www.engineeringwithsandeep.com| Student Assignment Problem Statement :1 • Inlet velocity is 80 m/s. • Pressure outlet • Calculate Cd value. Inlet Outlet Image 1
- 4. www.engineeringwithsandeep.com| Student Assignment CFD Setting Mesh Setting: Number of Nodes :79080 Number of Elements :78400 total volume (m3): 1.960000e-02 Aspect Ratio = 1.45401e+00 Orthogonal Quality = 9.98924e-01 Solver Setting • Model used : K-w ssh model • Working fluid :air • Solver : Coupled • Residual : 1e-8 Image 2 Image 3
- 5. www.engineeringwithsandeep.com| Student Assignment Results The reference value is taken from the Fluid mechanic's Book by Frank White. All value is taking at Re >=10^4. Table 1 Value Reference Value of Cd 2.1 Simulation Value 2.4124 Error E=(2.4124-2.1/2.1)*100 =14% Image 4 Image 5
- 6. www.engineeringwithsandeep.com| Student Assignment Problem Statement:2 • Inlet velocity is 80 m/s. • Pressure outlet • Calculate Cd value. Inlet Outlet Image 6
- 7. www.engineeringwithsandeep.com| Student Assignment CFD Setting Mesh Setting: Number of Nodes :31390 Number of Elements :30985 total volume (m3):1.982679e-02 Aspect Ratio = 3.11816e+00 Orthogonal Quality = 7.43891e-01 Solver Setting • Model used : K-w ssh model • Working fluid :air • Solver : Coupled • Residual : 1e-8 Image 7 Image 8
- 8. www.engineeringwithsandeep.com| Student Assignment Results The reference value is taken from the Fluid mechanic's Book by Frank White. All value is taking at Re >=10^4. Table 2 Value Reference Value of Cd 2.0 Simulation Value 2.5124 Error E=(2.5124-2.0/2.0)*100 =25% Image 9 Image 5
- 9. www.engineeringwithsandeep.com| Student Assignment Problem Statement:3 • Inlet velocity is 80 m/s. • Pressure outlet • Calculate Cd value. Inlet Outlet Image 10
- 10. www.engineeringwithsandeep.com| Student Assignment CFD Setting Mesh Setting: Number of Nodes : 31617 Number of Elements : 31217 total volume (m3):1.982679e-02 Aspect Ratio = 3.11816e+00 Orthogonal Quality = 7.43891e-01 Solver Setting • Model used : K-w ssh model • Working fluid :air • Solver : Coupled • Residual : 1e-8 Image 11 Image 12
- 11. www.engineeringwithsandeep.com| Student Assignment Results The reference value is taken from the Fluid mechanic's Book by Frank White. All value is taking at Re >=10^4. Table 3 Value Reference Value of Cd 2.0 Simulation Value 2.6124 Error E=(2.6124-2.0/2.0)*100 =30% Image 13 Image 5