Senior Research Fellow
PD Dr. phil. nat. Johannes Lenhard
FB Maschinenbau und Verfahrenstechnik
Lehrstuhl für Thermodynamik
Tel.: +49(0)631 205-5587
Fax: +49(0)631 205-3835
I am a philosopher and my DFG-funded research project allowes me to turn philosophy of science into philosophy in science.
Project: Measuring the Unmeasurable. Trust, Validation, and the Social Organization of Science
Computer simulation has become a standard instrument in science and engineering. Simulation models help to fit theories into concrete contexts of application. These models are famous for their adjustability and can accommodate large amounts of data. The most interesting cases are those in which simulations do not merely reproduce known data or phenomena but advance into the empirically unknown where data for comparison are not available. There are many cases in which experimental evidence cannot be obtained, but models can be used for predictions. In such cases, simulation is used for what is called here "measuring the unmeasurable." Starting from this observation, the main research questions are how simulation models are validated and how trust in them is created, maintained, and justified. The project addresses these questions in an empirical (about actual practices) and a normative sense (about justification). It is structured by three interconnected dimensions: epistemology, methodology, and institutional organization. The project leaves beaten pathways because it examines cases from the engineering sciences where models have to perform in given (not idealized) contexts and because it embeds philosophical research in science and engineering.
Vorlesungsbetreuung / Sprechzeiten
Veröffentlichungen / Vorträge / Poster
- "Calculated Surprises. A Philosophy of Computer Simulation" in 2019 became a part of the Oxford Studies in Philosophy of Science.
- Three recent publications
Lenhard, J. and Küster, U. (2019). "Reproducibility and the Concept of Numerical Solution", Minds and Machines, 29(1), pp. 19-36. DOI 10.1007/s11023-019-09492-9
Gramelsberger, G.; Lenhard, J; and Parker, W.S. (2019). "Philosophical Perspectives on Earth System Modeling: Truth, Adequacy, and Understanding", Journal of Advances in Modeling Earth Systems
. Published online first: doi.org/10.1029/2019MS001720
Lenhard, J. (2018). "Holism or the Erosion of Modularity. A Methodological Challenge for Validation", Philosophy of Science, 85, pp.832-844.
- Here you find a list of my publications.
Here you find a detailed CV.
|1998||Dissertation in Mathematics (University of Frankfurt)|
Habilitation in Philosophy (Bielefeld University)
|2018/2019||Associate Professor, Department of Philosophy, University of South Carolina, Columbia (academic year)|
|seit 01/2020||Wissenschaftlicher Mitarbeiter am Lehrstuhl für Thermodynamik (LTD), Technische Universität Kaiserslautern|