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Asyari Daryus

Darma Persada University, Teknik Mesin, Faculty Member

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Mr. Asyari Daryus at present is a lecturer in Mechanical Engineering Department, Darma Persada University Jakarta, Indonesia. He hold the doctoral degree in Mechanical Engineering from Universitas Indonesia, Jakarta, Indonesia, master degree in Materials Science from Universitas Indonesia and bachelor degree in Mechanical Engineering from Universitas Indonesia. He also hold the bachelor and master degrees in Management and Islamic religion. He has written many lecture materials.

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Universitas Mataram

prayoga hartono

wisnu ariansyah

Mataram University

Rizky Putra Adilana

University of Jember

Universitas Muhammadiyah Palembang

mario napitupulu

ITS Surabaya

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Books by Asyari Daryus

DIKTAT MEKANIKA KEKUATAN MATERIAL

Jakarta: Universitas Darma Persada, 2009

Diktat Mekanika Kekuatan Material untuk mahasiswa teknik, khususnya mahasiswa teknik mesin

TERMODINAMIKA TEKNIK, VOLUME II

Universitas Darma Persada, 2020

Modul kuliah termodinamika teknik, bagian 2, untuk mahasiswa teknik mesin khususnya, dan mahasisw... more

MANAJEMEN PERAWATAN MESIN

Universitas Darma Persada, 2019

Modul kuliah Manajemen Perawatan Mesin, diperuntukan untuk mahasiswa teknik.

TERMODINAMIKA TEKNIK, VOLUME I, EDISI E-BOOK

Universitas Darma Persada, Jakarta, 2019

Modul kuliah termodinamika teknik, volume 1, edisi e-book untuk mahasiswa teknik mesin khususnya ... more

TERMODINAMIKA TEKNIK, VOLUME I

Universitas Darma Persada, 2019

Modul kuliah termodinamika teknik, bagian 1, untuk mahasiswa teknik mesin khususnya, dan mahasisw... more

Papers by Asyari Daryus

Manajemen Perawatan Preventif Menggunakan Metode Kompleksitas Perbaikan

Jurnal Rekayasa Teknologi, Vol.1, No. 1, 2011

Untuk mempermudah dalam menghitung kegiatan perawatan mesin terutama perawatan preventif, dicoba ... more Untuk mempermudah dalam menghitung kegiatan perawatan mesin terutama perawatan preventif, dicoba memperkenalkan konsep "Komplesitas Perbaikan". Kompleksitas Perbaikan merupakan suatu indeks (angka) yang mengukur tingkat kerumitan sebuah peralatan/mesin. Dengan indeks ini bisa ditentukan berbagai hal yang diantaranya adalah menentukan kebutuhan jam-orang (man-hour) suatu pekerjaan perawatan dan lama maksimum mesin berhenti beroperasi selama pekerjaan perawatan. Jam-orang suatu pekerjaan adalah merupakan angka kebutuhan tenaga kerja untuk pekerjaan tersebut. Jam-orang merupakan perkalian antara jam yang diperlukan untuk menyelesaikan pekerjaan dengan jumlah orang yang mengerjakan pekerjaan tersebut. Waktu berhenti beroperasinya mesin dalam pekerjaan perawatan juga merupakan faktor penting dalam menentukan berapa lama mesin tersebut tidak bisa memberikan pelayanan (service) atau berapa lama waktu produksi yang hilang karena mesin tersebut tidak beroperasi. Dengan indeks kompleksitas perbaikan, kedua hal diatas dapat dengan mudah dihitung. Dapat disimpulkan bahwa dengan metode kompleksitas perbaikan, penataan pekerjaan perawatan akan lebih mudah.

CFD SIMULATION OF TURBULENT FLOWS IN PROTO X-3 BIOENERGY MICRO GAS TURBINE COMBUSTOR USING STD k-ε AND RNG k-ε MODEL FOR GREEN BUILDING APPLICATION

International Journal of Technology, 2016

This paper presents a numerical analysis of gas flow in the annular combustion chamber of a Proto... more This paper presents a numerical analysis of gas flow in the annular combustion chamber of a Proto X-3 Bioenergy micro gas turbine for green building applications. The computational fluids dynamics (CFD) simulation was conducted in two dimensions, turbulent flow and gas phase combustion, with the goal of comparing the effects of different models in real conditions. Two different turbulence models, standard (STD) k-ε and renormalization group (RNG) k-ε, were applied for simulations. The fuel used was biogas produced from animal waste. Fuel consumption was assumed to be 100 kJ/s for simulations. The results of the simulations were analyzed and compared for reference. The temperature and the mass fraction of CH 4 , H 2 , O 2 , and CO 2 distributions gave almost the same results for both models; therefore, both models (STD k-ε and RNG k-ε) could be used to represent the combustion process phenomenon without many significant differences.

CFD ANALYSIS OF SLURRY FLOW IN AN ANAEROBIC DIGESTER

International Journal of Technology, 2016

This study uses biogas, an environmentally friendly renewable energy resource, to operate the pro... more This study uses biogas, an environmentally friendly renewable energy resource, to operate the prototype of a micro-gas turbine (MGT) system called the Proto X-3 Bioenergy Micro-gas Turbine, designed for green building application. The biogas is produced by an anaerobic digester. The aim of this research is to simulate slurry flow in an anaerobic digester as the basis for developing a biogas digester that will produce biogas to meet the requirements of the Proto X-3 Bioenergy Micro-gas Turbine. The digester is a rectangular type with 3.4 m 3 capacity. The flow calculations and simulations were done using Computational Fluid Dynamics (CFD) methods in two-dimensional, body-fitted coordinate mesh. The simulations were conducted with various baffle clearances for the digester: 50 mm, 100 mm, and 150 mm. The CFD simulations showed that the recirculation phenomena was found in all flows but that the 50-mm baffle clearance model had the largest recirculation, and it would lead to better mixing of the slurry.

TURBULENCE MODEL AND VALIDATION OF AIR FLOW IN WIND TUNNEL

by Asyari Daryus and Gun Gun R Gunadi

International Journal of Technology, 2016

As an initial analysis, numerical simulation has more advantages in saving time and costs regardi... more As an initial analysis, numerical simulation has more advantages in saving time and costs regarding experiments. For example, variations in flow conditions and geometry can be adjusted easily to obtain results. Computational fluid dynamics (CFD) methods, such as the k-ε model, renormalization group (RNG) k-ε model and reynolds stress model (RSM), are widely used to conduct research on different objects and conditions. Choosing the appropriate model helps produce and develop constant values. Modeling studies as appropriate, i.e., in the turbulent flow simulation in the wind tunnel, is done to get a more accurate result. This study was conducted by comparing the results of the simulation k-ε model, RNG k-ε model and RSM, which is validated by the test results. The air had a density of 1,205 kg/m 3 , a viscosity of 4×10-5 m 2 /s and a normal speed of 6 m/s. By comparing the simulation results of the k-ε model, RNG k-ε model and RSM, which is validated by the test results, the third turbulence model provided good results to predict the distribution of speed and pressure of the fluid flow in the wind tunnel. As for predicting the turbulent kinetic energy, turbulent dissipation rate and turbulent effective viscosity, the k-ε model was effectively used with comparable results to the RSM models.

DIKTAT MEKANIKA KEKUATAN MATERIAL

Jakarta: Universitas Darma Persada, 2009

Diktat Mekanika Kekuatan Material untuk mahasiswa teknik, khususnya mahasiswa teknik mesin

TERMODINAMIKA TEKNIK, VOLUME II

Universitas Darma Persada, 2020

Modul kuliah termodinamika teknik, bagian 2, untuk mahasiswa teknik mesin khususnya, dan mahasisw... more

MANAJEMEN PERAWATAN MESIN

Universitas Darma Persada, 2019

Modul kuliah Manajemen Perawatan Mesin, diperuntukan untuk mahasiswa teknik.

TERMODINAMIKA TEKNIK, VOLUME I, EDISI E-BOOK

Universitas Darma Persada, Jakarta, 2019

Modul kuliah termodinamika teknik, volume 1, edisi e-book untuk mahasiswa teknik mesin khususnya ... more

TERMODINAMIKA TEKNIK, VOLUME I

Universitas Darma Persada, 2019

Modul kuliah termodinamika teknik, bagian 1, untuk mahasiswa teknik mesin khususnya, dan mahasisw... more

Manajemen Perawatan Preventif Menggunakan Metode Kompleksitas Perbaikan

Jurnal Rekayasa Teknologi, Vol.1, No. 1, 2011

Untuk mempermudah dalam menghitung kegiatan perawatan mesin terutama perawatan preventif, dicoba ... more Untuk mempermudah dalam menghitung kegiatan perawatan mesin terutama perawatan preventif, dicoba memperkenalkan konsep "Komplesitas Perbaikan". Kompleksitas Perbaikan merupakan suatu indeks (angka) yang mengukur tingkat kerumitan sebuah peralatan/mesin. Dengan indeks ini bisa ditentukan berbagai hal yang diantaranya adalah menentukan kebutuhan jam-orang (man-hour) suatu pekerjaan perawatan dan lama maksimum mesin berhenti beroperasi selama pekerjaan perawatan. Jam-orang suatu pekerjaan adalah merupakan angka kebutuhan tenaga kerja untuk pekerjaan tersebut. Jam-orang merupakan perkalian antara jam yang diperlukan untuk menyelesaikan pekerjaan dengan jumlah orang yang mengerjakan pekerjaan tersebut. Waktu berhenti beroperasinya mesin dalam pekerjaan perawatan juga merupakan faktor penting dalam menentukan berapa lama mesin tersebut tidak bisa memberikan pelayanan (service) atau berapa lama waktu produksi yang hilang karena mesin tersebut tidak beroperasi. Dengan indeks kompleksitas perbaikan, kedua hal diatas dapat dengan mudah dihitung. Dapat disimpulkan bahwa dengan metode kompleksitas perbaikan, penataan pekerjaan perawatan akan lebih mudah.

CFD SIMULATION OF TURBULENT FLOWS IN PROTO X-3 BIOENERGY MICRO GAS TURBINE COMBUSTOR USING STD k-ε AND RNG k-ε MODEL FOR GREEN BUILDING APPLICATION

International Journal of Technology, 2016

This paper presents a numerical analysis of gas flow in the annular combustion chamber of a Proto... more This paper presents a numerical analysis of gas flow in the annular combustion chamber of a Proto X-3 Bioenergy micro gas turbine for green building applications. The computational fluids dynamics (CFD) simulation was conducted in two dimensions, turbulent flow and gas phase combustion, with the goal of comparing the effects of different models in real conditions. Two different turbulence models, standard (STD) k-ε and renormalization group (RNG) k-ε, were applied for simulations. The fuel used was biogas produced from animal waste. Fuel consumption was assumed to be 100 kJ/s for simulations. The results of the simulations were analyzed and compared for reference. The temperature and the mass fraction of CH 4 , H 2 , O 2 , and CO 2 distributions gave almost the same results for both models; therefore, both models (STD k-ε and RNG k-ε) could be used to represent the combustion process phenomenon without many significant differences.

CFD ANALYSIS OF SLURRY FLOW IN AN ANAEROBIC DIGESTER

International Journal of Technology, 2016

This study uses biogas, an environmentally friendly renewable energy resource, to operate the pro... more This study uses biogas, an environmentally friendly renewable energy resource, to operate the prototype of a micro-gas turbine (MGT) system called the Proto X-3 Bioenergy Micro-gas Turbine, designed for green building application. The biogas is produced by an anaerobic digester. The aim of this research is to simulate slurry flow in an anaerobic digester as the basis for developing a biogas digester that will produce biogas to meet the requirements of the Proto X-3 Bioenergy Micro-gas Turbine. The digester is a rectangular type with 3.4 m 3 capacity. The flow calculations and simulations were done using Computational Fluid Dynamics (CFD) methods in two-dimensional, body-fitted coordinate mesh. The simulations were conducted with various baffle clearances for the digester: 50 mm, 100 mm, and 150 mm. The CFD simulations showed that the recirculation phenomena was found in all flows but that the 50-mm baffle clearance model had the largest recirculation, and it would lead to better mixing of the slurry.

TURBULENCE MODEL AND VALIDATION OF AIR FLOW IN WIND TUNNEL

by Asyari Daryus and Gun Gun R Gunadi

International Journal of Technology, 2016

As an initial analysis, numerical simulation has more advantages in saving time and costs regardi... more As an initial analysis, numerical simulation has more advantages in saving time and costs regarding experiments. For example, variations in flow conditions and geometry can be adjusted easily to obtain results. Computational fluid dynamics (CFD) methods, such as the k-ε model, renormalization group (RNG) k-ε model and reynolds stress model (RSM), are widely used to conduct research on different objects and conditions. Choosing the appropriate model helps produce and develop constant values. Modeling studies as appropriate, i.e., in the turbulent flow simulation in the wind tunnel, is done to get a more accurate result. This study was conducted by comparing the results of the simulation k-ε model, RNG k-ε model and RSM, which is validated by the test results. The air had a density of 1,205 kg/m 3 , a viscosity of 4×10-5 m 2 /s and a normal speed of 6 m/s. By comparing the simulation results of the k-ε model, RNG k-ε model and RSM, which is validated by the test results, the third turbulence model provided good results to predict the distribution of speed and pressure of the fluid flow in the wind tunnel. As for predicting the turbulent kinetic energy, turbulent dissipation rate and turbulent effective viscosity, the k-ε model was effectively used with comparable results to the RSM models.