scholarly journals Code and Solution Verification Assessment of the CTF Thermal Hydraulic Subchannel Code

2021 ◽  
Author(s):  
Robert Salko Jr ◽  
M. Pilch ◽  
Vineet Kumar
Keyword(s):  
Solution Verification

URANS Calculations for Smooth Circular Cylinder Flow in a Wide Range of Reynolds Numbers: Solution Verification and Validation

2012 ◽  
Vol 134 (12) ◽  
Author(s):  
Guilherme F. Rosetti ◽  
Guilherme Vaz ◽  
André L. C. Fujarra
Keyword(s):  
Large Range ◽  
Reynolds Numbers ◽  
Uncertainty Estimation ◽  
Wide Range ◽  
Modeling Errors ◽  
Solution Verification ◽  
Sst Turbulence Model ◽  
Validation Procedure ◽  
Cylinder Flow ◽  
Fixed Cylinder

The flow around circular smooth fixed cylinder in a large range of Reynolds numbers is considered in this paper. In order to investigate this canonical case, we perform CFD calculations and apply verification & validation (V&V) procedures to draw conclusions regarding numerical error and, afterwards, assess the modeling errors and capabilities of this (U)RANS method to solve the problem. Eight Reynolds numbers between Re = 10 and Re=5×105 will be presented with, at least, four geometrically similar grids and five discretization in time for each case (when unsteady), together with strict control of iterative and round-off errors, allowing a consistent verification analysis with uncertainty estimation. Two-dimensional RANS, steady or unsteady, laminar or turbulent calculations are performed. The original 1994 k-ω SST turbulence model by Menter is used to model turbulence. The validation procedure is performed by comparing the numerical results with an extensive set of experimental results compiled from the literature.

scholarly journals Proses Berpikir Kreatif Siswa dalam Memecahkan Masalah Matematika Berdasarkan Model Wallas

2017 ◽  
Vol 10 (1) ◽  
pp. 18 ◽  
Author(s):  
Agus Purnama Sari ◽  
M Ikhsan ◽  
Saminan Saminan
Keyword(s):  
Qualitative Research ◽  
Problem Solving ◽  
Creative Thinking ◽  
Model Problem ◽  
High Category ◽  
Mathematics Problems ◽  
Mathematics Ability ◽  
Solution Verification ◽  
The Given

[Bahasa]: Penelitian kualitatif ini bertujuan untuk mengetahui proses berpikir kreatif siswa dalam memecahkan masalah matematika berdasarkan model Wallas (1926). Subjek penelitian terdiri dari 6 siswa kelas VII, masing-masing dua siswa memiliki kemampuan matematika tinggi, sedang, dan rendah. Pengumpulan data dilakukan dengan menggunakan tes dan wawancara. Hasil penelitian menunjukkan bahwa proses berpikir kreatif siswa kategori tinggi yaitu siswa memahami permasalahan dan informasi yang diberikan dengan menuliskan apa yang diketahui maupun yang ditanyakan (persiapan), siswa tidak membutuhkan waktu yang lama untuk memikirkan solusi dari permasalahan yang dihadapi dengan mengingat soal yang sudah diajarkan (inkubasi), siswa mendapatkan ide untuk memecahkan masalah (Iluminasi), dan siswa menguji ide dan memeriksa kembali pemecahan masalah sebelum mengambil kesimpulan yang tepat (verifikasi). Proses berpikir kreatif siswa kategori sedang yaitu siswa mencoba untuk memahami permasalahan akan tetapi kurang memahami informasi atau petunjuk yang diberikan (persiapan), siswa diam megingat kembali rumus yang digunakan untuk memecahkan masalah (Inkubasi), siswa menghasilkan ide berdasarkan pemahamannya terhadap soal untuk memecahkan masalah (Iluminasi), dan siswa menguji ide dihasilkan dan tidak memeriksa kembali proses pemecahan masalah (verifikasi). Proses berpikir kreatif siswa kategori rendah yaitu siswa tidak memahami permasalahan dan informasi yang diberikan (persiapan), siswa membutuhkan waktu yang lama untuk memikirkan solusi dari permasalahan (Inkubasi), siswa gagal dalam menemukan ide untuk memecahkan permasalahan (Iluminasi), dan siswa menguji ide yang dihasilkan dan tidak memeriksa kembali jawaban yang telah diujikan (verifikasi). Kata kunci: Berpikir Kreatif; Model Wallas; Pemecahan Masalah; Kemampuan Siswa  [English]: This qualitative research aims at getting insight on students’ creative thinking in solving mathematics problems based on Wallas’ model (1926). The subjects are six students in 7th grade, each two students respectively have high, medium and low mathematics ability.  Data is collected through test and interview. This research shows that the students in high category can understand the problem and given information by writing what is known and asked (preparation), can easily think the solution of the problem by remembering the previous problem (incubation), get the ideas to solve the problem (illumination), and examine the ideas and re-check the solution before drawing the proper conclusion (verification). The students in medium category try to understand the problem but they are less in understanding the given information or hint (preparation), remember the formula to solve the problem (incubation), generate the ideas from their understanding to solve the problem (illumination), and examine the ideas and do not check the solution again (verification). For students in low category, they do not understand the problem and the given information (preparation), have a while to think the solution (incubation), fail to find any ideas to solve the problem (illumination), and examine the generated ideas and do not re-check the solution (verification).     Keywords: Creative Thinking; Walla’s Model; Problem Solving; Students’Ability

Workshop on Verification and Validation of CFD for Offshore Flows

2012 ◽  
Author(s):  
L. Eça ◽  
G. Vaz
Keyword(s):  
Reynolds Numbers ◽  
Verification And Validation ◽  
Test Cases ◽  
Code Verification ◽  
Complex Flow ◽  
Solution Verification ◽  
Manufactured Solution ◽  
Cylinder Flow ◽  
Flow Case ◽  
Paper Submission

This document introduces the Workshop on Verification and Validation (V&V) of CFD for Offshore Flows, to be held during OMAE2012. It presents a brief introduction to the purpose of Verification and Validation with the identification of the goals of code and solution verification and validation. Within this context, three test-cases are proposed: Case-I of code verification, Case-II of solution verification and Case-III of solution verification and validation. Case-I consists on a 3D manufactured solution of an unsteady turbulent flow. Case-II is an exercise on the canonical problem of the infinite smooth circular cylinder flow at different Reynolds numbers. Case-III is a more complex flow around a straked-riser. The participants are asked to perform at least one of these test-cases. The objectives for the three proposed test-cases are presented, together with a detailed description of the numerical settings to be used, and the results to be obtained and sent to the Workshop organization. At the end some considerations on general conditions, paper submission, deadlines, and encouragements are stated.

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