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Imam Mukhlash
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Departemen Matematika, Gedung F Lantai II, Kampus ITS, Keputih, Sukolilo-Surabaya 60111 Jawa Timur, Indonesia Phone: +62 31-5943354 Email:ijcsam.matematika@its.ac.id
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International Journal of Computing Science and Applied Mathematics-IJCSAM
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : -     EISSN : 24775401     DOI : -
Core Subject : Education,
Mathematics
IJCSAM (International Journal of Computing Science and Applied Mathematics) is an open access journal publishing advanced results in the fields of computations, science and applied mathematics, as mentioned explicitly in the scope of the journal. The journal is geared towards dissemination of original research and practical contributions by both scientists and engineers, from both academia and industry. IJCSAM (International Journal of Computing Science and Applied Mathematics) is a journal published by Pusat Publikasi Ilmiah LPPM, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia.
Arjuna Subject : Matematika - Matematika Terapan
Articles 143 Documents
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Numerical Study of Vortex Shedding Control Using Viscoelastic Flow Over an Elliptical Cylinder Annisa Dwi Sulistyaningtyas; Basuki Widodo; Chairul Imron; Hanim Faizah
(IJCSAM) International Journal of Computing Science and Applied Mathematics Vol. 12 No. 1 (2026)
Publisher : LPPM Institut Teknologi Sepuluh Nopember

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Abstract

Vortex-Induced Vibration (VIV) mitigation is a critical issue in engineering systems involving bluff bodies subjected to fluid flow. This study presents a numerical investigation of viscoelastic fluid flow over an elliptical cylinder as a passive control strategy to suppress vortex shedding. The governing continuity, momentum, and energy equations for an incompressible viscoelastic fluid are formulated and solved using an implicit finite difference method. The viscoelastic behavior of the fluid is incorporated through a nonlinear constitutive model, and the resulting system of equations is transformed into a dimensionless form to facilitate analysis. The study focuses on the effects of key parameters, including the viscoelastic parameter K, the Prandtl number P r, and the geometric aspect ratio a/b of the elliptical cylinder. Numerical simulations are performed using MATLAB to evaluate the resulting velocity and temperature distributions within the boundary layer region. The results indicate that increasing the viscoelastic parameter significantly reduces the peak velocity near the wall and weakens the velocity gradient, leading to a decrease in shear stress. In addition, higher viscoelasticity contributes to a thicker momentum and thermal boundary layer, which reduces the rate of heat transfer from the surface. Furthermore, variations in the Prandtl number and aspect ratio are found to influence the localization of thermal and momentum transport. Higher values of P r result in thinner thermal boundary layers and enhanced temperature gradients near the surface, while changes in a/b primarily affect the near-wall flow structure. Overall, the combined effects of viscoelasticity and geometric modification demonstrate a strong potential for attenuating vortex shedding and reducing the likelihood and intensity of VIV. These findings provide valuable insights for the design of engineering systems involving non-Newtonian fluids and flow-induced vibrations.
Optimal Incentive Mechanism for ISO 9001 Quality Audit: A Mechanism Design Approach Jani Rahardjo; I Nyoman Sutapa; Togar Wiliater Soloan Panjaitan
(IJCSAM) International Journal of Computing Science and Applied Mathematics Vol. 12 No. 1 (2026)
Publisher : LPPM Institut Teknologi Sepuluh Nopember

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Abstract

This paper develops a principal–agent model for ISO 9001:2015 quality audit in a manufacturing company, where the auditee is an informed agent and the auditor is a principal who designs an incentive-compatible audit mechanism. The proposed mechanism combines self-reported performance, risk-based audit probabilities, and quadratic penalties on deviations between reported and verified performance. We establish explicit mathematical conditions for incentive compatibility and individual rationality that guarantee truthful reporting and substantive compliance as the optimal strategy for the auditee. The mechanism is shown to be constrained Pareto optimal within a natural class of audit contracts: no alternative contract can increase the auditor’s expected utility without reducing the agent’s utility, given the informational constraints. We prove the uniqueness of this optimal solution given a maximum feasible penalty. A parametric sensitivity analysis and a case study from the Indonesian manufacturing sector illustrate how the choice of audit probability, certification benefit, and penalty parameter can transform a symbolic certification regime into an equilibrium with genuine quality improvement and credible ISO 9001 implementation
Graphs with Large Locating Rainbow Vertex Connection Number Tita Maryati; Fawwaz Fakhrurrozi Hadiputra
(IJCSAM) International Journal of Computing Science and Applied Mathematics Vol. 12 No. 1 (2026)
Publisher : LPPM Institut Teknologi Sepuluh Nopember

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Abstract

The locating rainbow vertex connection number of G, denoted by rvcl(G), is the least positive integer k such that there exists a k-coloring of G that ensures G is rainbow vertex-connected and each vertex has a distinct rainbow code. To learn how this parameter behave in graphs, it is natural to consider the extremal case. In this paper, we investigate several graphs with the difference of its order and its locating rainbow vertex connection number is not larger than three, i.e. rvcl(G) ∈ {n, n − 1, n − 2, n − 3} for graphs of order n.Furthermore, we demonstrate the existence of a graph with arbitrary large difference of its partition dimension and its locating rainbow vertex connection number. The study provides an overview of some structures that distinguishability under chromatic constraints becomes most costly, as in large number of colors needed.

Page 15 of 15 | Total Record : 143

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